Network Tools
Public IPs, address owners and DNS records, for people who deploy and run servers. 2 tools
2 tools
Network tools at work
Filling in an allowlist
IP Lookup shows the address a website sees and a second reading taken over UDP. On a dual-stack network these are often one IPv6 and one IPv4 address, and an allowlist usually needs both.
An address from a log
Paste it into IP Lookup to see the registered owner, the AS that announces it, and whether it is a Tor exit or sits in a cloud provider's published range.
After moving a server or a mailbox
DNS Lookup shows the A, MX and TXT records a domain has right now. The TTL next to each record is the time left in the resolver's cache; until it reaches zero, other resolvers may still hand out the old record.
A router address that does not match
Paste the WAN address from your router's admin page into IP Lookup. When the type shows a carrier-grade NAT shared address (100.64.0.0/10), no port forwarding rule on your router will receive incoming connections.
Where requests go
Each tool states which requests leave your device and where they go. Address lookups go to the regional registry and to RIPEstat, DNS records are queried by the browser directly at Cloudflare's DNS, and list checks run in the browser.
