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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.

140.205.122.243

243.122.205.140.in-addr.arpa

Zone 205.140.in-addr.arpa28 queries in 0.8 s2026-11-09 06:11:28 UTC

WHOIS for 140.205.122.243 →TextJSON
  • Problem 243.122.205.140.in-addr.arpa doesn't exist (NXDOMAIN from 205.140.in-addr.arpa's nameservers).

Resolution trace

  1. .asked f.root-servers.net 192.5.5.2416.5 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 b.in-addr-servers.arpa 199.253.183.1836.0 ms

    Referral to 140.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.

    199.180.182.53 failed: NOERROR

  3. 140.in-addr.arpa.asked u.arin.net 204.61.216.505.6 ms

    Referral to 205.140.in-addr.arpa. unsigned delegation

    • rdns1.alidns.com 140.205.122.253 2401:b180:4100::14
    • rdns2.alidns.com 140.205.122.243 2401:b180:4100::15

    No glue for rdns1.alidns.com, rdns2.alidns.com: addresses looked up via a resolver.

    193.0.9.10 failed: NOERROR

  4. 205.140.in-addr.arpa.asked rdns1.alidns.com 140.205.122.253197 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 243.122.205.140.in-addr.arpa (140.205.122.243)
; 2026-11-09 06:11:28 UTC, 28 queries in 0.78 s, zone 205.140.in-addr.arpa

;; FINDINGS
;  [ERROR] 243.122.205.140.in-addr.arpa doesn't exist (NXDOMAIN from 205.140.in-addr.arpa's nameservers).

;; TRACE
;  243.122.205.140.in-addr.arpa PTR
;  . @f.root-servers.net (192.5.5.241) 6.5 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. @b.in-addr-servers.arpa (199.253.183.183) 6.0 ms [NOERROR qr]: referral to 140.in-addr.arpa.
140.in-addr.arpa.		NS	r.arin.net.	; 199.180.180.63 2001:500:f0::63
140.in-addr.arpa.		NS	u.arin.net.	; 204.61.216.50 2001:500:14:6050:ad::1
140.in-addr.arpa.		NS	x.arin.net.	; 199.180.180.63 2001:500:f0::63
140.in-addr.arpa.		NS	y.arin.net.	; 192.82.134.30 2001:500:127::30
140.in-addr.arpa.		NS	z.arin.net.	; 199.180.180.63 2001:500:f0::63
140.in-addr.arpa.		NS	arin.authdns.ripe.net.	; 193.0.9.10 2a13:27c0:30::10
140.in-addr.arpa.	86400	IN	DS	30527 8 2 45E06D6D1051D6E38BB7D0C7E81FBDE58C067F215395E4769F2DBCD5F6DA29B9
;  140.in-addr.arpa. @u.arin.net (204.61.216.50) 5.6 ms [NOERROR qr]: referral to 205.140.in-addr.arpa.
205.140.in-addr.arpa.		NS	rdns1.alidns.com.	; 140.205.122.253 2401:b180:4100::14
205.140.in-addr.arpa.		NS	rdns2.alidns.com.	; 140.205.122.243 2401:b180:4100::15
;  205.140.in-addr.arpa. @rdns1.alidns.com (140.205.122.253) 197 ms [NXDOMAIN qr aa]: NXDOMAIN

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