How it works
Explainer: why are there only 13 DNS root server groups?
This target is one of the DNS root servers. A deep dive into the 512-byte UDP limit, the protocol history that fixed the count at 13, and how a thousand-plus anycast mirrors carry global resolution.
M-root · WIDE Project · Tokyo, Japan · 12 anycast sites
Trace which IPs a domain has resolved to, or which domains have historically pointed at an IP, with first/last-seen windows. Note: for IP queries the results overlap heavily with Reverse IP, so this tool is better suited to domain lookups; for IP snapshots, use Reverse IP directly.