Focused diagnostics
IP tools
Run focused ip checks with verdicts, measured values, evidence and exact fixes. Every tool is available in the browser and through the public SysGlass API.
Reverse DNS (PTR)
Free reverse DNS / PTR lookup for IPv4 and IPv6. See the hostname an IP resolves to, plus the exact reverse-DNS name (in-addr.arpa / ip6.arpa) to publish a PTR record at.
Input: 8.8.8.8 or 2001:4860:4860::8888
PTR Record Generator
Free PTR record generator. Enter an IPv4 or IPv6 address to get the exact reverse-DNS name (in-addr.arpa / ip6.arpa), a ready-to-paste PTR record, and the delegated reverse zone (/24 or /64). No more hand-writing reversed IPv6 nibbles.
Input: 2606:4700:4700::1111 or 8.8.8.8
IP Geolocation
Free IP geolocation lookup. Find the approximate city, country, coordinates, timezone, network (ASN/org) and ISP for any IPv4 or IPv6 address.
Input: 8.8.8.8 or 2606:4700:4700::1111
ASN Lookup
Free ASN lookup with AS reputation. Find which Autonomous System (AS number, network name, prefix, country) announces any IP, plus whether the AS is on Spamhaus ASN-DROP or UCEPROTECT Level 3.
Input: 1.1.1.1