Made in / Donate

DNS lookup

Everything DNS says about a domain: traced from the root servers down, every record type asked of the domain's own nameservers, each nameserver checked, then every hostname and policy record it points at followed, with SPF, DMARC, DKIM and DNSSEC checked along the way.

Try example.com, gmail.com, www.github.com, dnssec-failed.org, 1.1.1.1. A URL, e-mail address or IP address works too.

81.144.28.238

238.28.144.81.in-addr.arpa

Zone 28.144.81.in-addr.arpa29 queries in 1.3 s2026-11-09 05:35:06 UTC

WHOIS for 81.144.28.238 →TextJSON
  • Problem 238.28.144.81.in-addr.arpa doesn't exist (NXDOMAIN from 28.144.81.in-addr.arpa's nameservers). The domain isn't registered, or its registration has lapsed.

Resolution trace

  1. .asked d.root-servers.net 199.7.91.136.4 ms

    Referral to in-addr.arpa. signed (4 DS)

    • a.in-addr-servers.arpa 199.180.182.53 2620:37:e000::53
    • b.in-addr-servers.arpa 199.253.183.183 2001:500:87::87
    • c.in-addr-servers.arpa 196.216.169.10 2001:43f8:110::10
    • d.in-addr-servers.arpa 200.10.60.53 2001:13c7:7010::53
    • e.in-addr-servers.arpa 203.119.86.101 2001:dd8:6::101
    • f.in-addr-servers.arpa 193.0.9.1 2a13:27c0:30::1

    198.97.190.53 failed: NOERROR

  2. in-addr.arpa.asked d.in-addr-servers.arpa 200.10.60.53118 ms

    Referral to 81.in-addr.arpa. signed (1 DS)

    • ns3.lacnic.net 200.3.13.14 2001:13c7:7002:3000::14
    • ns4.apnic.net 202.12.31.53 2001:dd8:12::53
    • rirns.arin.net 199.253.249.53 2620:38:2000::53
    • ns3.afrinic.net 204.61.216.100 2001:500:14:6100:ad::1
    • pri.authdns.ripe.net 193.0.9.5 2a13:27c0:30::5

    No glue for ns3.lacnic.net, ns4.apnic.net, rirns.arin.net, ns3.afrinic.net, pri.authdns.ripe.net: addresses looked up via a resolver.

  3. 81.in-addr.arpa.asked ns4.apnic.net 202.12.31.5316 ms

    Referral to 144.81.in-addr.arpa. unsigned delegation

    • ns2.bt.net 217.32.105.90
    • ns1.bt.net 217.32.105.91
    • ns0.bt.net 217.35.209.188

    No glue for ns2.bt.net, ns1.bt.net, ns0.bt.net: addresses looked up via a resolver.

  4. 144.81.in-addr.arpa.asked ns2.bt.net 217.32.105.9029 ms

    NXDOMAIN: this name does not exist.

Public resolvers

What four public resolvers answer right now, from their caches. Highlighted values differ from the authoritative answer: either a recent change they haven't picked up yet (the TTL says how long until they do), or, for A and AAAA, a CDN or geo-routed site handing each resolver location its own addresses.

ResolverPTR
Cloudflare 1.1.1.1NXDOMAIN
Google 8.8.8.8NXDOMAIN
Quad9 9.9.9.9NXDOMAIN
OpenDNS 208.67.222.222NXDOMAIN

Text dump

; DNS report for 238.28.144.81.in-addr.arpa (81.144.28.238)
; 2026-11-09 05:35:06 UTC, 29 queries in 1.33 s, zone 28.144.81.in-addr.arpa

;; FINDINGS
;  [ERROR] 238.28.144.81.in-addr.arpa doesn't exist (NXDOMAIN from 28.144.81.in-addr.arpa's nameservers). The domain isn't registered, or its registration has lapsed.

;; TRACE
;  238.28.144.81.in-addr.arpa PTR
;  . @d.root-servers.net (199.7.91.13) 6.4 ms [NOERROR qr]: referral to in-addr.arpa.
in-addr.arpa.		NS	a.in-addr-servers.arpa.	; 199.180.182.53 2620:37:e000::53
in-addr.arpa.		NS	b.in-addr-servers.arpa.	; 199.253.183.183 2001:500:87::87
in-addr.arpa.		NS	c.in-addr-servers.arpa.	; 196.216.169.10 2001:43f8:110::10
in-addr.arpa.		NS	d.in-addr-servers.arpa.	; 200.10.60.53 2001:13c7:7010::53
in-addr.arpa.		NS	e.in-addr-servers.arpa.	; 203.119.86.101 2001:dd8:6::101
in-addr.arpa.		NS	f.in-addr-servers.arpa.	; 193.0.9.1 2a13:27c0:30::1
in-addr.arpa.	86400	IN	DS	47054 8 2 5CAFCCEC201D1933B4C9F6A9C8F51E51F3B39979058AC21B8DF1B1F281CBC6F2
in-addr.arpa.	86400	IN	DS	53696 8 2 13E5501C56B20394DA921B51412D48B7089C5EB6957A7C58553C4D4D424F04DF
in-addr.arpa.	86400	IN	DS	54956 8 2 E0E2BF5CFBD66572CA05EC18267D91509BA6A9405AF05C3FD4141DFA45200C08
in-addr.arpa.	86400	IN	DS	63982 8 2 AAF4FB5D213EF25AE44679032EBE3514C487D7ABD99D7F5FEC3383D030733C73
;  in-addr.arpa. @d.in-addr-servers.arpa (200.10.60.53) 118 ms [NOERROR qr]: referral to 81.in-addr.arpa.
81.in-addr.arpa.		NS	ns3.lacnic.net.	; 200.3.13.14 2001:13c7:7002:3000::14
81.in-addr.arpa.		NS	ns4.apnic.net.	; 202.12.31.53 2001:dd8:12::53
81.in-addr.arpa.		NS	rirns.arin.net.	; 199.253.249.53 2620:38:2000::53
81.in-addr.arpa.		NS	ns3.afrinic.net.	; 204.61.216.100 2001:500:14:6100:ad::1
81.in-addr.arpa.		NS	pri.authdns.ripe.net.	; 193.0.9.5 2a13:27c0:30::5
81.in-addr.arpa.	86400	IN	DS	57427 13 2 A6631EDEF599CBD0396A973F158B00334A9FEC4E3B097BBCA607552FCCA19B0A
;  81.in-addr.arpa. @ns4.apnic.net (202.12.31.53) 16 ms [NOERROR qr]: referral to 144.81.in-addr.arpa.
144.81.in-addr.arpa.		NS	ns2.bt.net.	; 217.32.105.90
144.81.in-addr.arpa.		NS	ns1.bt.net.	; 217.32.105.91
144.81.in-addr.arpa.		NS	ns0.bt.net.	; 217.35.209.188
;  144.81.in-addr.arpa. @ns2.bt.net (217.32.105.90) 29 ms [NXDOMAIN qr aa]: NXDOMAIN

;; PUBLIC RESOLVERS
;  Cloudflare PTR   NXDOMAIN
;  Google     PTR   NXDOMAIN
;  Quad9      PTR   NXDOMAIN
;  OpenDNS    PTR   NXDOMAIN