Most used tools
The checks sysadmins run every day.
- Blacklist checkCheck an IP, a range or a domain against 33 blacklists.Run check
- Email deliverability testSend one email, get a spam score and the fixes.Run check
- SPF, DKIM and DMARC checkAll email DNS records for a domain in one check.Run check
- DNS propagation checkerSee your records from resolvers around the world.Run check
- SSL certificate checkerExpiry, chain and hostname match for any site.Run check
- Subnet calculatorCIDR, mask, host range and a visual split.Run check
- What is my IPYour public IPv4 and IPv6 address and network.Run check
- RAID calculator Editor’s pickUsable space, fault tolerance and rebuild time.Run check
Free tools for server administrators. Every check runs on srvscripts.com or in your browser, with no sign-up and nothing stored. Press / to search.
Website and SEO checks
One-click website health check plus security headers, redirects, robots.txt, sitemaps, llms.txt, security.txt and favicons.
- Favicon Checker Check every site icon a page declares: /favicon.ico, icon and apple-touch-icon links, the icon Google can show in search results, and the web app manifest with…
- Favicon Generator Create favicon.ico, Apple and Android icons, a maskable icon, site.webmanifest and the HTML tags from one image, all in your browser.
- HTTP Redirect Checker HTTP lookup and redirect chain tracer: follow every hop with its status code and time, compare the http://, https://, www and non-www variants, and read the…
- llms.txt Validator Validate an llms.txt file against the llmstxt.org format: site heading, summary blockquote, sections, link lists with descriptions, the Optional section and whether the linked pages actually…
- Robots.txt Checker Fetch and validate robots.txt, test any path for Googlebot, Bingbot and other search engines, and see which AI crawlers (GPTBot, ClaudeBot, PerplexityBot, Google-Extended and more) are…
- Security Headers Checker Grade the HTTP security headers of any page: HSTS, Content-Security-Policy, clickjacking protection, nosniff, Referrer-Policy, Permissions-Policy, COOP, version disclosure and cookie flags.
- security.txt Checker Check a domain's security.txt against RFC 9116: the /.well-known/ location, the required Contact and Expires fields, Canonical, optional fields such as Policy and Encryption, and a…
- Website Health Check One test for the basics of a public website: certificate, redirects, security headers, speed, indexing, robots.txt, sitemap, llms.txt, security.txt and icons, with a score and a…
- XML Sitemap Validator Find and validate an XML sitemap or sitemap index: well-formed XML, namespace, URL and size limits, lastmod format, foreign hosts and http:// URLs, plus a live…
AI server tools
AI assistants that read logs, explain errors and write scripts, configs and firewall rules. Always review the output before you run it.
- AI Command Explainer and Risk Checker for Linux and PowerShell Paste a shell, PowerShell, cmd or SQL command and get a risk rating, a part-by-part explanation, side effects and a safer alternative before you run it.
- AI Config Generator for Nginx, Apache, PHP-FPM and MariaDB Describe your server and requirements and get a commented Nginx, Apache, .htaccess, PHP-FPM, php.ini, my.cnf, Redis, sshd, Postfix, logrotate or systemd config — sized for your…
- AI Cron Builder Cron Jobs and systemd Timers from Plain English Describe when a job should run and get a crontab entry with logging and overlap protection, the next five run times, and an equivalent systemd timer.
- AI Email Deliverability Fixer with Live DNS Checks Enter your sending domain: srvScripts runs live SPF, DKIM, DMARC, MX, MTA-STS and domain blacklist checks and the AI explains what is wrong and which DNS…
- AI Error Explainer for Server, Hosting and Windows Errors Paste an error message from cPanel, DirectAdmin, Plesk, Linux, MariaDB, PHP, Exim or Windows Server and get what it means, the likely causes and how to…
- AI fail2ban Regex Generator Filters and Jails from Log Lines Paste a few log lines you want to ban on and get a fail2ban filter with anchored failregex, a jail with maxretry, findtime and bantime, and…
- AI Firewall Rule Builder for CSF, firewalld, nftables and UFW Describe what should be allowed or blocked and get ordered rules for CSF, firewalld, nftables, iptables, UFW or Windows Defender Firewall — with persistence, verification and…
- AI Log Analyzer for Server Logs (Apache, Nginx, Exim, MariaDB) Paste Apache, Nginx, LiteSpeed, Exim, Postfix, MariaDB, PHP-FPM or Windows logs and get a plain-English summary, the likely root cause and the commands to fix it.
- AI Script Generator for Bash, PowerShell and Python Describe an admin task and get a complete Bash, PowerShell or Python script with strict mode, a dry-run or -WhatIf switch, logging and instructions to test…
- AI Slow Query Advisor for MySQL and MariaDB Paste a slow MySQL or MariaDB query, optionally with EXPLAIN output and SHOW CREATE TABLE, and get a diagnosis, exact index statements, a rewrite and how…
Email and deliverability
SPF, DKIM, DMARC, MTA-STS, BIMI, SMTP and header checks for mail that lands in the inbox.
- BIMI Checker Check a domain's BIMI record, whether DMARC is at enforcement, whether the logo is a valid SVG Tiny PS file and whether a VMC or CMC…
- BIMI Generator Convert your logo to a BIMI-ready SVG Tiny PS file, get the default._bimi TXT record to publish and check whether your DMARC policy is ready.
- DKIM Checker Check DKIM public keys published in DNS: test a specific selector or scan 23 common selectors, see the key type and length, and spot revoked or…
- DKIM Key Generator 2048-bit Key Pair and DNS Record Generate a DKIM RSA key pair in your browser and get the TXT record, PEM keys and install steps for OpenDKIM, Exim, cPanel and DirectAdmin.
- DMARC Checker Look up and explain a domain's DMARC record: policy, subdomain policy, percentage, reporting addresses and alignment, with warnings for p=none and missing reports.
- DMARC Record Generator Create a DMARC TXT record with the right policy, reporting address, percentage and alignment settings, plus the cross-domain authorisation record when reports go elsewhere.
- DMARC Report Analyzer Open a DMARC aggregate (RUA) report as received (.xml, .xml.gz or .zip) and see every sending source, message counts, SPF and DKIM alignment and what the…
- Email Deliverability Test (Spam Score) Send a real email to a one-time test address and get a score out of 10: SPF, DKIM and DMARC alignment, reverse DNS, HELO and TLS,…
- Email Domain Health Check One check for a domain's email setup: MX, SPF, DMARC, MTA-STS, TLS-RPT, BIMI, CAA and DNSSEC, with a pass/warn/fail for each.
- Email Header Analyzer Paste message headers to see the delivery path hop by hop with delays, SPF/DKIM/DMARC results, spam filter verdicts and From/Return-Path alignment problems.
- IP Warm-Up Schedule Generator for New Mail Servers Build a day-by-day IP warm-up plan from your target volume and number of IPs, with Gmail, Microsoft and Yahoo sender requirements.
- Lookalike Domain Checker New Find Typo and Look-Alike Domains Find registered typo and look-alike domains of your domain, see which ones have mail servers, and learn what to do about them. Free, DNS-only check.
- MTA-STS Checker Check a domain's MTA-STS setup: the _mta-sts TXT record, the HTTPS policy file, its mode and max_age, whether every MX host is covered, and the TLS-RPT…
- MTA-STS Generator TXT Record and Policy File Generate the _mta-sts TXT record, the mta-sts.txt policy file and its hosting URL, with an optional TLS-RPT record.
- MX Lookup Find the mail servers for a domain in priority order, with each server's IP address and reverse DNS, and flag MX hosts whose PTR record does…
- SMTP Bounce Explainer New What Your Bounce Message Means Paste a bounce or SMTP error and get the meaning of its status codes, the likely cause and the fix, including Gmail, Microsoft and Spamhaus messages.
- SMTP Test Free STARTTLS, Certificate and Banner Check Connects to a mail server on port 587 or 465, reads the greeting, negotiates TLS and shows the certificate, TLS version, AUTH methods and reverse DNS,…
- SPF Lookup Counter New Check the 10 DNS Lookup Limit Count every DNS lookup in a domain's SPF record against the RFC 7208 limit of 10, find void lookups, duplicates and dead terms, and get a…
- SPF Record Checker Validate a domain's SPF record: follow every include and redirect, count DNS lookups against the limit of 10, find void lookups, multiple records and risky +all…
- SPF Record Generator Build a valid SPF record from your server IPs and the services that send for you (Google Workspace, Microsoft 365, MailBaby and others) with the right…
- TLS-RPT Checker Check a domain's SMTP TLS Reporting record (RFC 8460): the _smtp._tls TXT record, the rua report destinations, duplicate records and whether MTA-STS is published alongside it.
- TLS-RPT Record Generator _smtp._tls TXT Record Generate a TLS-RPT TXT record at _smtp._tls with mailto and https report destinations, encoded the way RFC 8460 requires.
Blacklist and reputation
Bulk IP, range and domain blacklist checks, reverse DNS and monitoring.
- IP Blacklist Check Bulk IPs, CIDR Ranges and Domains (33 Lists) Check up to 256 IP addresses, CIDR ranges, hostnames and domains against 30 IP blacklists and 3 domain blacklists at once, with reverse DNS, listing reasons,…
- Reverse DNS Lookup Free Bulk PTR Check for 25 IPs Look up the PTR records for up to 25 IPv4 or IPv6 addresses at once and check that each hostname resolves back to the same IP…
DNS and domains
Record lookups, propagation, DNSSEC, CAA and WHOIS for any domain.
- CAA and TLSA Checker Free CAA Record and DANE Test Reads CAA records (including those inherited from parent domains), compares them with the CA of the live certificate, and checks TLSA records for HTTPS and the…
- DNS Lookup Query Any Record Type Look up A, AAAA, CNAME, MX, NS, TXT, SOA, CAA, DS, DNSKEY and HTTPS records for any domain from 17 public resolvers or the domain's own…
- DNS Propagation Checker Check whether a DNS change has reached 17 public resolvers run by Google, Cloudflare, Quad9, OpenDNS, AdGuard, Yandex, AliDNS and others, with TTLs and a consensus…
- DNS TXT Record Splitter Split Long Values Into 255-Byte Strings Split long TXT values (DKIM keys, SPF) into 255-byte quoted strings for BIND and Cloudflare, or join split strings back into one value.
- DNSSEC Checker Check whether a domain is signed with DNSSEC: DS records at the registry, DNSKEY records in the zone, matching key tags, algorithms and live validation through…
- Domain Health Checker Free Score for DNS, SSL, Email and Headers One scan that scores a domain out of 100 across DNS, HTTPS, security headers and email authentication, with a prioritised list of fixes.
- WHOIS Lookup Free RDAP Domain and IP Owner Check Look up domain registration (registrar, dates, status, name servers, DNSSEC), IP address ownership (network, range, abuse contact) and AS numbers using the registries' RDAP service.
SSL/TLS and certificates
Check, decode and match certificates, CSRs and private keys.
- Certificate Key Matcher Free Safe Cert and Key Check Check whether an SSL certificate, private key and CSR belong together by comparing their public keys in your browser. The private key never leaves your computer.
- CSR Decoder Decode a certificate signing request in your browser: see the subject, Subject Alternative Names, key type and size and signature algorithm before you send it to…
- SSL Certificate Checker Check a website's or mail server's TLS certificate: trust chain, expiry, hostname match, issuer, key type, protocol and cipher — on ports 443, 465, 993, 995,…
- SSL Certificate Decoder Decode a PEM SSL/TLS certificate in your browser: subject, issuer, validity dates, SAN names, key, signature algorithm, serial number and SHA-256/SHA-1 fingerprints.
- TLS Version Checker Test which TLS protocol versions a server accepts on web, mail and control panel ports, confirm TLS 1.0 and 1.1 are disabled, and see the negotiated…
Network and IP
Subnet calculators, IP conversion, latency and your public IP.
- ASN Lookup Look up the autonomous system behind an IP address or domain, with its BGP prefix, country and registry, or enter an AS number to see its…
- IP Address Converter Convert an IPv4 address between dotted decimal, integer, hexadecimal and binary, and see its IPv4-mapped IPv6, 6to4, NAT64 and reverse-DNS forms.
- IP Subnet Calculator (IPv4 CIDR) Visual IPv4 subnet calculator: enter an address with a prefix or mask to see the network, broadcast, usable host range, masks, a bit-by-bit view, where the…
- IPv6 Subnet Calculator Expand and compress IPv6 addresses, find the network, first and last address of any prefix, count /64 subnets and build the ip6.arpa PTR name.
- MAC Address Converter Convert a MAC address between colon, hyphen, Cisco dot and plain formats, see whether it is unicast or multicast and universal or locally set, and get…
- Online Ping Test from Multiple Countries Ping a hostname or IP from real probes in several countries at once and compare round-trip time and packet loss by location, powered by the Globalping…
- Online Traceroute from Multiple Countries Run a traceroute to any host from probes in several countries, using classic ICMP, TCP to port 443 to pass firewalls, or UDP, and see each…
- Open Port Checker New Test TCP Ports on Any Public Server Check whether TCP ports are open on a public server: up to 10 ports per test, presets for web, mail and control panels, open, closed or…
- TCP Ping (Port 80/443 Latency) Measure connection time to a host on port 443 or 80 with four TCP handshakes — works even where ICMP ping is blocked by firewalls.
- What Is My IP Address? See your public IP address as servers see it, with reverse DNS, network owner and country — useful for firewall whitelisting in CSF, cPHulk, Imunify360 or…
Monitoring and uptime
Is it down, uptime and certificate expiry alerts by e-mail.
- Uptime SSL Blacklist Monitor Free Email Alerts Get free e-mail alerts when your website goes down, your SSL certificate is about to expire or your server IP or domain is listed on a…
- Website Down Checker (Is It Down?) Check whether a website is up from our server: HTTP status, redirect chain, response time, server software and security headers — a quick is-it-down-or-just-me test.
Server configuration and generators
Web server config checks, systemd, cron, chmod, redirects, RAID and passwords.
- .htaccess Redirect Generator Generate tested 301 redirect rules for Apache and LiteSpeed .htaccess, with the nginx equivalent: force HTTPS, www or non-www, move a whole domain, redirect a page…
- chmod Calculator Convert Linux file permissions between octal (755) and symbolic (rwxr-xr-x) notation, see what owner, group and others can do, and catch world-writable settings.
- cPanel and DirectAdmin Server Check Check a cPanel, WHM, DirectAdmin or Plesk server from the outside: 16 standard hosting ports, panel and mail certificates, STARTTLS on 587, plain FTP and HTTP…
- Cron Expression Helper Explain any 5-field cron expression in plain English and list its next eight run times, including ranges, steps, names and @daily-style shortcuts.
- nginx Config Checker Find Security and Syntax Mistakes Static review of an nginx configuration in your browser: syntax slips, old TLS protocols, missing HSTS and redirects, add_header inheritance, PHP-FPM and proxy pitfalls, with suggested…
- PHP-FPM Calculator New pm.max_children and Spare Servers Calculate pm.max_children, start_servers and spare servers from RAM and PHP-FPM worker size, with cPanel and DirectAdmin config locations.
- RAID Calculator Visual RAID calculator for RAID 0, 1, 5, 6, 10, 50, 60, ZFS RAIDZ1 to RAIDZ3 and Synology SHR: mixed disk sizes, hot spares, usable space…
- Secure Password Generator Generate strong random passwords or passphrases in your browser using the Web Crypto API — for root, database, WHM, panel and API credentials.
- systemd Unit Generator Service and Timer Files With Safe Defaults Generates a systemd service unit, and a timer unit for scheduled jobs, with a dedicated user, restart policy and recommended sandboxing, plus the verify and enable…
- Time Zone Converter and Server Time Zone Settings World clock and time zone converter with daylight saving details, plus ready-to-copy time zone settings for timedatectl, cPanel and WHM, DirectAdmin, php.ini, WordPress, MariaDB/MySQL and cron.
- Unix Timestamp Converter Convert Unix timestamps in seconds, milliseconds, microseconds or nanoseconds to dates in UTC and any time zone, convert a date back to a timestamp, and copy…
VoIP and telephony
SIP DNS records and bandwidth planning for voice.
- Asterisk Dialplan Pattern Tester Which Extension Matches? Test Asterisk extension patterns against a dialled number and see which one Asterisk picks, with the X, Z, N, [ ], . and ! rules explained.
- Call Recording Converter GSM, WAV49, µ-law and SLN to MP3 Converts Asterisk, FreePBX, Issabel and Vicidial call recordings (.gsm, GSM-in-WAV, µ-law, A-law, .sln, .au) to MP3 or WAV in batches, in your browser, with nothing uploaded.
- Call Recording Transcription for Asterisk, FreePBX and Vicidial Upload an Asterisk, FreePBX or Vicidial call recording (.gsm, WAV49, .wav, µ-law, A-law) and get a timestamped transcript with caller and agent separated. TXT, SRT and…
- Erlang Calculator How Many SIP Channels (Erlang B) or Call Centre Agents (Erlang C) Work out how many SIP channels or trunks you need for a target blocking rate (Erlang B), or how many agents a call centre needs for…
- PJSIP NAT Settings Generator Asterisk, FreePBX, Issabel, VitalPBX, 3CX Generate the PJSIP NAT settings for Asterisk or FreePBX: transport local_net and external addresses, endpoint rtp_symmetric, force_rport and rewrite_contact, rtp.conf, router port forwards and the commands…
- SIP Firewall Rules Generator iptables, nftables, UFW, firewalld, CSF and pfSense Generate firewall rules for Asterisk, FreePBX and other SIP servers: SIP limited to your provider and phones, the RTP range open, scanner protection, and the matching…
- SIP Response Codes Lookup for Every SIP Error, With Causes and Fixes Look up any SIP response code (403, 404, 408, 480, 486, 488, 503 and more) or Q.850 hangup cause and see what it means, the usual…
- SIP SRV Checker Free NAPTR, SRV and SIP TLS Test Checks the DNS records SIP phones and trunks use to find your server: NAPTR transport preference, SRV records for UDP, TCP and TLS, and whether every…
- SIP Trace Analyzer Find NAT, Codec and Dropped-Call Problems in a SIP Log Paste a SIP trace from sngrep, pjsip set logger, sip set debug or tcpdump and get the call flow, codecs, media addresses and the likely cause…
- sip.conf to pjsip.conf Converter for Asterisk Convert sip.conf peers, templates and register lines to pjsip.conf endpoint, auth, aor, identify and registration sections in your browser.
- STIR/SHAKEN Identity Header Decoder (PASSporT) Decode a SIP Identity header or PASSporT: attestation A/B/C, orig and dest numbers, iat age, origid and certificate URL. No signature check.
- VoIP Bandwidth Calculator Per-Call and Total Bandwidth by Codec Works out how much upload and download a number of concurrent calls needs for a given codec, packet interval, IP version, SRTP and VPN tunnel, with…
- VoIP MOS Calculator Call Quality (R-Factor) from Latency, Jitter and Packet Loss Estimate the MOS and R-factor of VoIP calls from latency, jitter, packet loss and codec with the ITU-T G.107 E-model, see where the score is lost,…
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