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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.

52.123.137.197

197.137.123.52.in-addr.arpa

Zone 137.123.52.in-addr.arpa42 queries in 0.4 s2026-11-09 05:35:07 UTC

WHOIS for 52.123.137.197 →TextJSON
  • Problem 197.137.123.52.in-addr.arpa doesn't exist (NXDOMAIN from 137.123.52.in-addr.arpa's nameservers). The domain isn't registered, or its registration has lapsed.

Resolution trace

  1. .asked h.root-servers.net 198.97.190.537.3 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
  2. in-addr.arpa.asked f.in-addr-servers.arpa 193.0.9.112 ms

    Referral to 52.in-addr.arpa. signed (1 DS)

    • r.arin.net 199.180.180.63 2001:500:f0::63
    • u.arin.net 204.61.216.50 2001:500:14:6050:ad::1
    • x.arin.net 199.180.180.63 2001:500:f0::63
    • y.arin.net 192.82.134.30 2001:500:127::30
    • z.arin.net 199.180.180.63 2001:500:f0::63
    • arin.authdns.ripe.net 193.0.9.10 2a13:27c0:30::10

    No glue for r.arin.net, u.arin.net, x.arin.net, y.arin.net, z.arin.net, arin.authdns.ripe.net: addresses looked up via a resolver.

    196.216.169.10 failed: NOERROR

  3. 52.in-addr.arpa.asked arin.authdns.ripe.net 193.0.9.1011 ms

    Referral to 123.52.in-addr.arpa. unsigned delegation

    • ns4-09.azure-dns.info 208.84.5.9 2620:1ec:bda:700::9
    • ns2-09.azure-dns.net 150.171.21.9 2620:1ec:8ec:700::9
    • ns1-09.azure-dns.com 13.107.236.9 2603:1061:0:700::9
    • ns3-09.azure-dns.org 204.14.183.9 2a01:111:4000:700::9

    No glue for ns4-09.azure-dns.info, ns2-09.azure-dns.net, ns1-09.azure-dns.com, ns3-09.azure-dns.org: addresses looked up via a resolver.

  4. 123.52.in-addr.arpa.asked ns2-09.azure-dns.net 150.171.21.96.3 ms

    Referral to 137.123.52.in-addr.arpa. unsigned delegation

    • ns1-01.azure-dns.com 13.107.236.1 2603:1061:0:700::1
    • ns2-01.azure-dns.net 150.171.21.1 2620:1ec:8ec:700::1
    • ns3-01.azure-dns.org 204.14.183.1 2a01:111:4000:700::1
    • ns4-01.azure-dns.info 208.84.5.1 2620:1ec:bda:700::1

    No glue for ns1-01.azure-dns.com, ns2-01.azure-dns.net, ns3-01.azure-dns.org, ns4-01.azure-dns.info: addresses looked up via a resolver.

    204.14.183.9 failed: NOERROR

  5. 137.123.52.in-addr.arpa.asked ns1-01.azure-dns.com 13.107.236.16.1 ms

    NXDOMAIN: this name does not exist.

    208.84.5.1 failed: NXDOMAIN

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 197.137.123.52.in-addr.arpa (52.123.137.197)
; 2026-11-09 05:35:07 UTC, 42 queries in 0.37 s, zone 137.123.52.in-addr.arpa

;; FINDINGS
;  [ERROR] 197.137.123.52.in-addr.arpa doesn't exist (NXDOMAIN from 137.123.52.in-addr.arpa's nameservers). The domain isn't registered, or its registration has lapsed.

;; TRACE
;  197.137.123.52.in-addr.arpa PTR
;  . @h.root-servers.net (198.97.190.53) 7.3 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. @f.in-addr-servers.arpa (193.0.9.1) 12 ms [NOERROR qr]: referral to 52.in-addr.arpa.
52.in-addr.arpa.		NS	r.arin.net.	; 199.180.180.63 2001:500:f0::63
52.in-addr.arpa.		NS	u.arin.net.	; 204.61.216.50 2001:500:14:6050:ad::1
52.in-addr.arpa.		NS	x.arin.net.	; 199.180.180.63 2001:500:f0::63
52.in-addr.arpa.		NS	y.arin.net.	; 192.82.134.30 2001:500:127::30
52.in-addr.arpa.		NS	z.arin.net.	; 199.180.180.63 2001:500:f0::63
52.in-addr.arpa.		NS	arin.authdns.ripe.net.	; 193.0.9.10 2a13:27c0:30::10
52.in-addr.arpa.	86400	IN	DS	37915 8 2 6D174AB775ACBCD38EE742BD94EA0498FFCCC923E39033616593CDF365838C02
;  52.in-addr.arpa. @arin.authdns.ripe.net (193.0.9.10) 11 ms [NOERROR qr]: referral to 123.52.in-addr.arpa.
123.52.in-addr.arpa.		NS	ns4-09.azure-dns.info.	; 208.84.5.9 2620:1ec:bda:700::9
123.52.in-addr.arpa.		NS	ns2-09.azure-dns.net.	; 150.171.21.9 2620:1ec:8ec:700::9
123.52.in-addr.arpa.		NS	ns1-09.azure-dns.com.	; 13.107.236.9 2603:1061:0:700::9
123.52.in-addr.arpa.		NS	ns3-09.azure-dns.org.	; 204.14.183.9 2a01:111:4000:700::9
;  123.52.in-addr.arpa. @ns2-09.azure-dns.net (150.171.21.9) 6.3 ms [NOERROR qr ad]: referral to 137.123.52.in-addr.arpa.
137.123.52.in-addr.arpa.		NS	ns1-01.azure-dns.com.	; 13.107.236.1 2603:1061:0:700::1
137.123.52.in-addr.arpa.		NS	ns2-01.azure-dns.net.	; 150.171.21.1 2620:1ec:8ec:700::1
137.123.52.in-addr.arpa.		NS	ns3-01.azure-dns.org.	; 204.14.183.1 2a01:111:4000:700::1
137.123.52.in-addr.arpa.		NS	ns4-01.azure-dns.info.	; 208.84.5.1 2620:1ec:bda:700::1
;  137.123.52.in-addr.arpa. @ns1-01.azure-dns.com (13.107.236.1) 6.1 ms [NXDOMAIN qr aa]: NXDOMAIN

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