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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.

85.158.142.217

217.142.158.85.in-addr.arpa

Zone 142.158.85.in-addr.arpa90 queries in 0.7 s2026-11-09 05:34:54 UTCNot DNSSEC-signed

WHOIS for 85.158.142.217 →TextJSON
  • Note 142.158.85.in-addr.arpa isn't signed with DNSSEC, so resolvers can't tell forged answers from real ones.

Records

Asked directly of ns-851.awsdns-42.net (205.251.195.83), an authoritative server: no cache in between, so these are the live values.

PTR Reverse pointer

7200PTRmail830.messagelabs.com.
ANY query: 1 records
7200PTRmail830.messagelabs.com.

No records of type A, AAAA, CNAME, DNAME, NS, SOA, MX, TXT, CAA, HTTPS, SVCB, SRV, NAPTR, DS, DNSKEY, CDS, CDNSKEY, NSEC3PARAM, TLSA, SSHFP, LOC, HINFO, RP, URI, SPF, OPENPGPKEY, ZONEMD, CSYNC.

Resolution trace

  1. .asked a.root-servers.net 198.41.0.412 ms

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

    • f.in-addr-servers.arpa 193.0.9.1 2a13:27c0:30::1
    • b.in-addr-servers.arpa 199.253.183.183 2001:500:87::87
    • d.in-addr-servers.arpa 200.10.60.53 2001:13c7:7010::53
    • a.in-addr-servers.arpa 199.180.182.53 2620:37:e000::53
    • c.in-addr-servers.arpa 196.216.169.10 2001:43f8:110::10
    • e.in-addr-servers.arpa 203.119.86.101 2001:dd8:6::101
  2. in-addr.arpa.asked b.in-addr-servers.arpa 199.253.183.1836.0 ms

    Referral to 85.in-addr.arpa. signed (1 DS)

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

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

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

    Referral to 142.158.85.in-addr.arpa. unsigned delegation

    • ns-851.awsdns-42.net 205.251.195.83 2600:9000:5303:5300::1
    • ns-1349.awsdns-40.org 205.251.197.69 2600:9000:5305:4500::1
    • ns-1984.awsdns-56.co.uk 205.251.199.192 2600:9000:5307:c000::1
    • ns-337.awsdns-42.com 205.251.193.81 2600:9000:5301:5100::1

    No glue for ns-851.awsdns-42.net, ns-1349.awsdns-40.org, ns-1984.awsdns-56.co.uk, ns-337.awsdns-42.com: addresses looked up via a resolver.

    200.3.13.14 failed: NOERROR

  4. 142.158.85.in-addr.arpa.asked ns-851.awsdns-42.net 205.251.195.836.1 ms

    Answer (authoritative):

    217.142.158.85.in-addr.arpa.7200PTRmail830.messagelabs.com.

Nameservers

Every address of every nameserver, asked for 142.158.85.in-addr.arpa's SOA. "Parent" means the 85.in-addr.arpa zone delegates to it; "zone" means 142.158.85.in-addr.arpa lists it itself.

NameserverListed inAddressStatusSerialTime
ns-1349.awsdns-40.orgparent + zone205.251.197.69 glueauthoritative15.9 ms
2600:9000:5305:4500::1 glueauthoritative16.7 ms
ns-1984.awsdns-56.co.ukparent + zone205.251.199.192 glueauthoritative111 ms
2600:9000:5307:c000::1 glueauthoritative112 ms
ns-337.awsdns-42.comparent + zone205.251.193.81 glueauthoritative111 ms
2600:9000:5301:5100::1 glueauthoritative112 ms
ns-851.awsdns-42.netparent + zone205.251.195.83 glueauthoritative15.8 ms
2600:9000:5303:5300::1 glueauthoritative17.3 ms

DNSSEC

142.158.85.in-addr.arpa isn't signed: no DS at the parent and no DNSKEY in the zone.

Hosts and reverse DNS

Every hostname the records point at, resolved to its addresses; each address's PTR (reverse DNS), with ✓ where the PTR name resolves back to the same address.

HostAddressReverse DNS (PTR)
ns-1349.awsdns-40.org
nameserver
205.251.197.69ns-1349.awsdns-40.org ✓
2600:9000:5305:4500::1ns-1349.awsdns-40.org ✓
ns-1984.awsdns-56.co.uk
nameserver
205.251.199.192ns-1984.awsdns-56.co.uk ✓
2600:9000:5307:c000::1ns-1984.awsdns-56.co.uk ✓
ns-337.awsdns-42.com
nameserver
205.251.193.81ns-337.awsdns-42.com ✓
2600:9000:5301:5100::1ns-337.awsdns-42.com ✓
ns-851.awsdns-42.net
nameserver
205.251.195.83ns-851.awsdns-42.net ✓
2600:9000:5303:5300::1ns-851.awsdns-42.net ✓
mail830.messagelabs.com
PTR target
85.158.142.217mail830.messagelabs.com ✓

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 1.1.1.1mail830.messagelabs.com.
TTL 7200
Google 8.8.8.8mail830.messagelabs.com.
TTL 7200
Quad9 9.9.9.9mail830.messagelabs.com.
TTL 7200
OpenDNS 208.67.222.222mail830.messagelabs.com.
TTL 7200

Text dump

; DNS report for 217.142.158.85.in-addr.arpa (85.158.142.217)
; 2026-11-09 05:34:54 UTC, 90 queries in 0.67 s, zone 142.158.85.in-addr.arpa

;; FINDINGS
;  [INFO] 142.158.85.in-addr.arpa isn't signed with DNSSEC, so resolvers can't tell forged answers from real ones.

;; RECORDS (authoritative, from ns-851.awsdns-42.net (205.251.195.83))
217.142.158.85.in-addr.arpa.	7200	IN	PTR	mail830.messagelabs.com.

;; TRACE
;  217.142.158.85.in-addr.arpa PTR
;  . @a.root-servers.net (198.41.0.4) 12 ms [NOERROR qr]: referral to in-addr.arpa.
in-addr.arpa.		NS	f.in-addr-servers.arpa.	; 193.0.9.1 2a13:27c0:30::1
in-addr.arpa.		NS	b.in-addr-servers.arpa.	; 199.253.183.183 2001:500:87::87
in-addr.arpa.		NS	d.in-addr-servers.arpa.	; 200.10.60.53 2001:13c7:7010::53
in-addr.arpa.		NS	a.in-addr-servers.arpa.	; 199.180.182.53 2620:37:e000::53
in-addr.arpa.		NS	c.in-addr-servers.arpa.	; 196.216.169.10 2001:43f8:110::10
in-addr.arpa.		NS	e.in-addr-servers.arpa.	; 203.119.86.101 2001:dd8:6::101
in-addr.arpa.	86400	IN	DS	63982 8 2 AAF4FB5D213EF25AE44679032EBE3514C487D7ABD99D7F5FEC3383D030733C73
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	47054 8 2 5CAFCCEC201D1933B4C9F6A9C8F51E51F3B39979058AC21B8DF1B1F281CBC6F2
;  in-addr.arpa. @b.in-addr-servers.arpa (199.253.183.183) 6.0 ms [NOERROR qr]: referral to 85.in-addr.arpa.
85.in-addr.arpa.		NS	ns3.lacnic.net.	; 200.3.13.14 2001:13c7:7002:3000::14
85.in-addr.arpa.		NS	ns3.afrinic.net.	; 204.61.216.100 2001:500:14:6100:ad::1
85.in-addr.arpa.		NS	ns4.apnic.net.	; 202.12.31.53 2001:dd8:12::53
85.in-addr.arpa.		NS	pri.authdns.ripe.net.	; 193.0.9.5 2a13:27c0:30::5
85.in-addr.arpa.		NS	rirns.arin.net.	; 199.253.249.53 2620:38:2000::53
85.in-addr.arpa.	86400	IN	DS	16960 13 2 640BCDD453B4760AE88FCD8FC36C158F13DCD74AAA1A033A7916A97B18118333
;  85.in-addr.arpa. @ns4.apnic.net (202.12.31.53) 16 ms [NOERROR qr]: referral to 142.158.85.in-addr.arpa.
142.158.85.in-addr.arpa.		NS	ns-851.awsdns-42.net.	; 205.251.195.83 2600:9000:5303:5300::1
142.158.85.in-addr.arpa.		NS	ns-1349.awsdns-40.org.	; 205.251.197.69 2600:9000:5305:4500::1
142.158.85.in-addr.arpa.		NS	ns-1984.awsdns-56.co.uk.	; 205.251.199.192 2600:9000:5307:c000::1
142.158.85.in-addr.arpa.		NS	ns-337.awsdns-42.com.	; 205.251.193.81 2600:9000:5301:5100::1
;  142.158.85.in-addr.arpa. @ns-851.awsdns-42.net (205.251.195.83) 6.1 ms [NOERROR qr aa ad]: answer
217.142.158.85.in-addr.arpa.	7200	IN	PTR	mail830.messagelabs.com.

;; NAMESERVERS (SOA asked of each address)
;  ns-1349.awsdns-40.org [parent+zone]
;    205.251.197.69                          ok                        1           5.9 ms
;    2600:9000:5305:4500::1                  ok                        1           6.7 ms
;  ns-1984.awsdns-56.co.uk [parent+zone]
;    205.251.199.192                         ok                        1           11 ms
;    2600:9000:5307:c000::1                  ok                        1           12 ms
;  ns-337.awsdns-42.com [parent+zone]
;    205.251.193.81                          ok                        1           11 ms
;    2600:9000:5301:5100::1                  ok                        1           12 ms
;  ns-851.awsdns-42.net [parent+zone]
;    205.251.195.83                          ok                        1           5.8 ms
;    2600:9000:5303:5300::1                  ok                        1           7.3 ms

;; DNSSEC: unsigned

;; HOSTS
;  ns-1349.awsdns-40.org (nameserver)
;    205.251.197.69                          PTR ns-1349.awsdns-40.org (confirmed)
;    2600:9000:5305:4500::1                  PTR ns-1349.awsdns-40.org (confirmed)
;  ns-1984.awsdns-56.co.uk (nameserver)
;    205.251.199.192                         PTR ns-1984.awsdns-56.co.uk (confirmed)
;    2600:9000:5307:c000::1                  PTR ns-1984.awsdns-56.co.uk (confirmed)
;  ns-337.awsdns-42.com (nameserver)
;    205.251.193.81                          PTR ns-337.awsdns-42.com (confirmed)
;    2600:9000:5301:5100::1                  PTR ns-337.awsdns-42.com (confirmed)
;  ns-851.awsdns-42.net (nameserver)
;    205.251.195.83                          PTR ns-851.awsdns-42.net (confirmed)
;    2600:9000:5303:5300::1                  PTR ns-851.awsdns-42.net (confirmed)
;  mail830.messagelabs.com (PTR target)
;    85.158.142.217                          PTR mail830.messagelabs.com (confirmed)

;; PUBLIC RESOLVERS
;  Cloudflare PTR   mail830.messagelabs.com.  ttl 7200
;  Google     PTR   mail830.messagelabs.com.  ttl 7200
;  Quad9      PTR   mail830.messagelabs.com.  ttl 7200
;  OpenDNS    PTR   mail830.messagelabs.com.  ttl 7200