Professional DNS & Network Tools
Comprehensive DNS lookup, network diagnostics, and monitoring tools — all in one place.
Start DNS LookupNetwork Diagnostic Tools
Everything you need to diagnose, monitor, and manage your DNS and network infrastructure.
DNS & Lookup
DNS Lookup
Query DNS records (A, AAAA, MX, NS, TXT, SOA, CNAME) for any domain
Reverse IP Lookup
Find all domains hosted on a specific IP address
Reverse Lookup
Get hostname from IP address (PTR record)
WHOIS
Get registration and contact info for domains and IPs
Email Blacklist (RBL)
Check if a mail server IP is blacklisted
DKIM Creator
Generate DKIM DNS records for your mail server
Nameserver Migration & Old NS Check
Compare a domain's nameserver (NS) delegation at the parent zone, in its own zone and across public resolvers; see what old nameservers still answer.
Network Diagnostics
Ping
Test response time and packet loss to any host
Traceroute
Trace the network path to a destination host
Port Check
Test if a TCP port is open on a specific host
Proxy Checker
Detect if an IP is a proxy, VPN, or Tor exit node
Country by IP
Detect country, city, and ISP from IP address
SSL & Certificate Tools
SSL Certificate Checker
Check your site's SSL/TLS certificate, chain (intermediates), expiry, hostname match and TLS versions.
CSR Decoder
Decode your certificate signing request (CSR): common name, organization, SANs, key type and size, signature algorithm.
Certificate Decoder
Decode a PEM, base64 DER or P7B certificate and see every field in readable form.
Certificate Chain Builder
If you only have your (leaf) certificate, find the missing intermediate certificates automatically and download the full chain for your server.
Certificate – Key – CSR Matcher
Check whether your private key, certificate and CSR belong to the same key pair. Runs entirely in your browser.
SSL Converter
Convert certificate and key formats: PEM ⇄ DER, PEM ⇄ P7B (PKCS#7), PEM ⇄ PFX/PKCS#12. Runs entirely in your browser.
CSR Generator
Generate a certificate signing request (CSR) and private key. The key is created in your browser and never sent anywhere.