>• ipconfig.is

Network tools

Audits, DNS and propagation, certificates, email authentication, HTTP traces, registry data and subnet maths. Every tool has a key-free API, and every result a link you can share.

All tools

• Domain security audit: TLS certificate, chain and versions
• DNS lookup: 20 record types, A to DNAME
• DNS propagation checker: 12 public resolvers worldwide
• TLS certificate checker: Validity and days remaining
• SPF, DKIM and DMARC checker: SPF with the 10-lookup limit
• HTTP redirect checker: Every redirect hop
• Domain WHOIS lookup: Registrar and registration date
• Subnet calculator: Network, broadcast and usable range

Every tool is also a key-free API call: see the API reference.