You use IPv4 protocol.
http://www.polarhome.com supports IPv6 too.

Hostname=
IP address=216.73.216.89

ISP information:





Connection information:
Connection=keep-alive
User agent=Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
Remote port=55176
Server port=80
Protocol=HTTP/1.1
Language=
Request=GET

nslookup response:
;; Got SERVFAIL reply from 192.168.10.36, trying next server
;; Got SERVFAIL reply from 192.168.10.36, trying next server
Server:		192.168.10.1
Address:	192.168.10.1#53

** server can't find 89.216.73.216.in-addr.arpa: SERVFAIL

dig -x response:

; <<>> DiG 9.8.4-P1-RedHat-9.8.4-3.P1.fc16 <<>> -x 216.73.216.89
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 44181
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;89.216.73.216.in-addr.arpa.	IN	PTR

;; Query time: 14 msec
;; SERVER: 192.168.10.36#53(192.168.10.36)
;; WHEN: Thu Jul 10 04:24:12 2025
;; MSG SIZE  rcvd: 44

dig A response:

; <<>> DiG 9.8.4-P1-RedHat-9.8.4-3.P1.fc16 <<>> A 216.73.216.89
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 44213
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0

;; QUESTION SECTION:
;216.73.216.89.			IN	A

;; AUTHORITY SECTION:
.			10800	IN	SOA	a.root-servers.net. nstld.verisign-grs.com. 2025070902 1800 900 604800 86400

;; Query time: 38 msec
;; SERVER: 192.168.10.36#53(192.168.10.36)
;; WHEN: Thu Jul 10 04:24:12 2025
;; MSG SIZE  rcvd: 106