2607:f1c0:100f:f000::248

Reverse address entry: 8.4.2.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.f.f.0.0.1.0.c.1.f.7.0.6.2.ip6.arpa

2607:f1c0:100f:f000::248 has no DNS entries .

Explore by label: 8 . 4 . 2 . 0 . 0 . 0 . 0 . 0 . 0 . 0 . 0 . 0 . 0 . 0 . 0 . 0 . 0 . 0 . 0 . f . f . 0 . 0 . 1 . 0 . c . 1 . f . 7 . 0 . 6 . 2 . ip6 . arpa

RIPE6 8.4.2.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.f.f.0.0.1.0.c.1.f.7.0.6.2.ip6.arpa
PTR2607-f1c0-100f-f000-0000-0000-0000-0248.elastic-ssl.ui-r.com expired since 1 week, 5 days
Show 1 expired records

This top-level domain has no publically available whois server. Try going to www.nic.arpa.