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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.

104.20.23.154

154.23.20.104.in-addr.arpa

Zone 20.104.in-addr.arpa28 queries in 0.5 s2026-11-09 05:24:53 UTC

WHOIS for 104.20.23.154 →TextJSON
  • Problem 154.23.20.104.in-addr.arpa doesn't exist (NXDOMAIN from 20.104.in-addr.arpa's nameservers).

Resolution trace

  1. .asked l.root-servers.net 199.7.83.4210 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 104.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.

  3. 104.in-addr.arpa.asked u.arin.net 204.61.216.505.8 ms

    Referral to 20.104.in-addr.arpa. unsigned delegation

    • kevin.ns.cloudflare.com 108.162.193.191 172.64.33.191 173.245.59.191 2606:4700:58::adf5:3bbf 2803:f800:50::6ca2:c1bf 2a06:98c1:50::ac40:21bf
    • cruz.ns.cloudflare.com 108.162.192.88 172.64.32.88 173.245.58.88 2606:4700:50::adf5:3a58 2803:f800:50::6ca2:c058 2a06:98c1:50::ac40:2058

    No glue for kevin.ns.cloudflare.com, cruz.ns.cloudflare.com: addresses looked up via a resolver.

    199.180.180.63 failed: NOERROR

  4. 20.104.in-addr.arpa.asked cruz.ns.cloudflare.com 173.245.58.887.2 ms

    NXDOMAIN: this name does not exist.

    172.64.32.88 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 154.23.20.104.in-addr.arpa (104.20.23.154)
; 2026-11-09 05:24:53 UTC, 28 queries in 0.48 s, zone 20.104.in-addr.arpa

;; FINDINGS
;  [ERROR] 154.23.20.104.in-addr.arpa doesn't exist (NXDOMAIN from 20.104.in-addr.arpa's nameservers).

;; TRACE
;  154.23.20.104.in-addr.arpa PTR
;  . @l.root-servers.net (199.7.83.42) 10 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 104.in-addr.arpa.
104.in-addr.arpa.		NS	r.arin.net.	; 199.180.180.63 2001:500:f0::63
104.in-addr.arpa.		NS	u.arin.net.	; 204.61.216.50 2001:500:14:6050:ad::1
104.in-addr.arpa.		NS	x.arin.net.	; 199.180.180.63 2001:500:f0::63
104.in-addr.arpa.		NS	y.arin.net.	; 192.82.134.30 2001:500:127::30
104.in-addr.arpa.		NS	z.arin.net.	; 199.180.180.63 2001:500:f0::63
104.in-addr.arpa.		NS	arin.authdns.ripe.net.	; 193.0.9.10 2a13:27c0:30::10
104.in-addr.arpa.	86400	IN	DS	40042 8 2 B88341BD64E1A398866CBCFE8467425F5F9F370824852C8E6DBE093C85BD6583
;  104.in-addr.arpa. @u.arin.net (204.61.216.50) 5.8 ms [NOERROR qr]: referral to 20.104.in-addr.arpa.
20.104.in-addr.arpa.		NS	kevin.ns.cloudflare.com.	; 108.162.193.191 172.64.33.191 173.245.59.191 2606:4700:58::adf5:3bbf 2803:f800:50::6ca2:c1bf 2a06:98c1:50::ac40:21bf
20.104.in-addr.arpa.		NS	cruz.ns.cloudflare.com.	; 108.162.192.88 172.64.32.88 173.245.58.88 2606:4700:50::adf5:3a58 2803:f800:50::6ca2:c058 2a06:98c1:50::ac40:2058
;  20.104.in-addr.arpa. @cruz.ns.cloudflare.com (173.245.58.88) 7.2 ms [NXDOMAIN qr aa]: NXDOMAIN

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