IP & Network Tools
These tools answer the questions that come up between DNS and the application: which host is behind this address, is the port actually reachable from outside, where does traffic stop, and which network announces the IP.
Diagnostic order
All ip & network tools
What's My IP
Your public IPv4/IPv6 and request headers
Reverse DNS (PTR) Lookup
Hostname behind an IP — required for mail servers
Subnet Calculator
CIDR ranges, masks, and usable hosts
Port Checker
Is a single TCP port open on a host?
Ping Test
ICMP reachability and latency from our server
Traceroute
Network path from our server to a host
ASN Lookup
Which network announces an IP, via RIPEstat