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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.

dns0.bbc.co.uk

Zone bbc.co.uk224 queries in 0.5 s2026-11-09 05:12:42 UTCNot DNSSEC-signed

WHOIS for bbc.co.uk →TextJSON
  • Note bbc.co.uk isn't signed with DNSSEC, so resolvers can't tell forged answers from real ones.

Records

Asked directly of dns1.bbc.co.uk (198.51.45.9), an authoritative server: no cache in between, so these are the live values.

A IPv4 address

86400A198.51.44.9

AAAA IPv6 address

86400AAAA2620:4d:4000:6259:7:9:0:1
ANY query: refused politely (RFC 8482)
900HINFO"RFC8482" ""

No records of type 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, PTR.

Resolution trace

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

    Referral to uk. signed (1 DS)

    • dns1.nic.uk 213.248.216.1 2a01:618:400::1
    • dns3.nic.uk 213.248.220.1 2a01:618:404::1
    • nsc.nic.uk 156.154.102.3 2610:a1:1009::3
    • nsa.nic.uk 156.154.100.3 2001:502:ad09::3
    • nsd.nic.uk 156.154.103.3 2610:a1:1010::3
    • dns2.nic.uk 103.49.80.1 2401:fd80:400::1
    • dns4.nic.uk 43.230.48.1 2401:fd80:404::1
    • nsb.nic.uk 156.154.101.3 2001:502:2eda::3
  2. uk.asked nsc.nic.uk 156.154.102.35.8 ms

    Referral to bbc.co.uk. unsigned delegation

    • dns0.bbc.com 198.51.44.73 2620:4d:4000:6259:7:9:0:3
    • dns1.bbc.co.uk 198.51.45.9 2a00:edc0:6259:7:9::2
    • ddns1.bbc.com 148.163.199.193 2607:f740:e04e:c::1
    • dns0.bbc.co.uk 198.51.44.9 2620:4d:4000:6259:7:9:0:1
    • ddns0.bbc.com 148.163.199.129 2607:f740:e04e:8::1
    • dns1.bbc.com 198.51.45.73 2a00:edc0:6259:7:9::4
    • ddns0.bbc.co.uk 148.163.199.1 2607:f740:e04e::1
    • ddns1.bbc.co.uk 148.163.199.65 2607:f740:e04e:4::1

    No glue for dns0.bbc.com, ddns1.bbc.com, ddns0.bbc.com, dns1.bbc.com: addresses looked up via a resolver.

    156.154.103.3 failed: NOERROR

  3. bbc.co.uk.asked dns1.bbc.co.uk 198.51.45.96.2 ms

    Answer (authoritative):

    dns0.bbc.co.uk.86400A198.51.44.9

    148.163.199.129 failed: NOERROR

Nameservers

Every address of every nameserver, asked for bbc.co.uk's SOA. "Parent" means the uk zone delegates to it; "zone" means bbc.co.uk lists it itself.

NameserverListed inAddressStatusSerialTime
ddns0.bbc.co.ukparent + zone148.163.199.1 glueauthoritative202611050016 ms
2607:f740:e04e::1 glueauthoritative202611050016 ms
ddns0.bbc.comparent + zone148.163.199.129 glueauthoritative202611050016 ms
2607:f740:e04e:8::1 glueauthoritative202611050017 ms
ddns1.bbc.co.ukparent + zone148.163.199.65 glueauthoritative202611050017 ms
2607:f740:e04e:4::1 glueauthoritative202611050017 ms
ddns1.bbc.comparent + zone148.163.199.193 glueauthoritative202611050017 ms
2607:f740:e04e:c::1 glueauthoritative202611050017 ms
dns0.bbc.co.ukparent + zone198.51.44.9 glueauthoritative202611050014 ms
2620:4d:4000:6259:7:9:0:1 glueauthoritative202611050014 ms
dns0.bbc.comparent + zone198.51.44.73 glueauthoritative202611050014 ms
2620:4d:4000:6259:7:9:0:3 glueauthoritative202611050014 ms
dns1.bbc.co.ukparent + zone198.51.45.9 glueauthoritative20261105006.6 ms
2a00:edc0:6259:7:9::2 glueauthoritative202611050014 ms
dns1.bbc.comparent + zone198.51.45.73 glueauthoritative20261105006.7 ms
2a00:edc0:6259:7:9::4 glueauthoritative202611050014 ms

DNSSEC

bbc.co.uk isn't signed: no DS at the parent and no DNSKEY in the zone.

Email

Mail servers (MX)

No MX records: mail goes to the name's A/AAAA address, if anything accepts it there.

SPF

No SPF record.

DMARC

v=DMARC1;p=reject;aspf=s;adkim=s;pct=100;fo=0;ri=86400; rua=mailto:dmarc_agg@vali.email;

From _dmarc.bbc.co.uk (the organisational domain's policy applies).

Policyreject
SPF alignmentstrict
DKIM alignmentstrict
Applies to100% of failing mail
Failure report options0
Report interval1 d
Aggregate reports tomailto:dmarc_agg@vali.email

DKIM

None of the 36 common selectors tried has a key. DKIM may still be set up under another selector: find it in the DKIM-Signature header (s=) of a mail from this domain.

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)
dns0.bbc.co.uk
the name looked up · nameserver
198.51.44.9ns4.demysdns.co.uk, dns1.p09.nsone.net ✓
2620:4d:4000:6259:7:9:0:1dns1.p09.nsone.net, ns4.demysdns.co.uk ✓
ddns0.bbc.co.uk
nameserver
148.163.199.1ns2.bbcdns.net ✓
2607:f740:e04e::1none
ddns0.bbc.com
nameserver
148.163.199.129ns2.bbcdns.net.uk ✓
2607:f740:e04e:8::1none
ddns1.bbc.co.uk
nameserver
148.163.199.65ns3.bbcdns.net ✓
2607:f740:e04e:4::1none
ddns1.bbc.com
nameserver
148.163.199.193ns3.bbcdns.net.uk ✓
2607:f740:e04e:c::1none
dns0.bbc.com
nameserver
198.51.44.73ns6.demysdns.co.uk, dns3.p09.nsone.net ✓
2620:4d:4000:6259:7:9:0:3dns3.p09.nsone.net, ns6.demysdns.co.uk ✓
dns1.bbc.co.uk
nameserver
198.51.45.9ns5.demysdns.co.uk, dns2.p09.nsone.net ✓
2a00:edc0:6259:7:9::2dns2.p09.nsone.net, ns5.demysdns.co.uk ✓
dns1.bbc.com
nameserver
198.51.45.73ns7.demysdns.com, dns4.p09.nsone.net ✓
2a00:edc0:6259:7:9::4dns4.p09.nsone.net, ns7.demysdns.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.

ResolverAAAAAMX
Cloudflare 1.1.1.1198.51.44.9
TTL 86400
2620:4d:4000:6259:7:9:0:1
TTL 86400
none
Google 8.8.8.8198.51.44.9
TTL 21600
2620:4d:4000:6259:7:9:0:1
TTL 21600
none
Quad9 9.9.9.9198.51.44.9
TTL 31517
2620:4d:4000:6259:7:9:0:1
TTL 33785
none
OpenDNS 208.67.222.222198.51.44.9
TTL 86400
2620:4d:4000:6259:7:9:0:1
TTL 86400
none

Text dump

; DNS report for dns0.bbc.co.uk
; 2026-11-09 05:12:42 UTC, 224 queries in 0.47 s, zone bbc.co.uk

;; FINDINGS
;  [INFO] bbc.co.uk isn't signed with DNSSEC, so resolvers can't tell forged answers from real ones.

;; RECORDS (authoritative, from dns1.bbc.co.uk (198.51.45.9))
dns0.bbc.co.uk.	86400	IN	A	198.51.44.9
dns0.bbc.co.uk.	86400	IN	AAAA	2620:4d:4000:6259:7:9:0:1

;; TRACE
;  dns0.bbc.co.uk A
;  . @a.root-servers.net (198.41.0.4) 12 ms [NOERROR qr]: referral to uk.
uk.		NS	dns1.nic.uk.	; 213.248.216.1 2a01:618:400::1
uk.		NS	dns3.nic.uk.	; 213.248.220.1 2a01:618:404::1
uk.		NS	nsc.nic.uk.	; 156.154.102.3 2610:a1:1009::3
uk.		NS	nsa.nic.uk.	; 156.154.100.3 2001:502:ad09::3
uk.		NS	nsd.nic.uk.	; 156.154.103.3 2610:a1:1010::3
uk.		NS	dns2.nic.uk.	; 103.49.80.1 2401:fd80:400::1
uk.		NS	dns4.nic.uk.	; 43.230.48.1 2401:fd80:404::1
uk.		NS	nsb.nic.uk.	; 156.154.101.3 2001:502:2eda::3
uk.	86400	IN	DS	43876 8 2 A107ED2AC1BD14D924173BC7E827A1153582072394F9272BA37E2353BC659603
;  uk. @nsc.nic.uk (156.154.102.3) 5.8 ms [NOERROR qr]: referral to bbc.co.uk.
bbc.co.uk.		NS	dns0.bbc.com.	; 198.51.44.73 2620:4d:4000:6259:7:9:0:3
bbc.co.uk.		NS	dns1.bbc.co.uk.	; 198.51.45.9 2a00:edc0:6259:7:9::2
bbc.co.uk.		NS	ddns1.bbc.com.	; 148.163.199.193 2607:f740:e04e:c::1
bbc.co.uk.		NS	dns0.bbc.co.uk.	; 198.51.44.9 2620:4d:4000:6259:7:9:0:1
bbc.co.uk.		NS	ddns0.bbc.com.	; 148.163.199.129 2607:f740:e04e:8::1
bbc.co.uk.		NS	dns1.bbc.com.	; 198.51.45.73 2a00:edc0:6259:7:9::4
bbc.co.uk.		NS	ddns0.bbc.co.uk.	; 148.163.199.1 2607:f740:e04e::1
bbc.co.uk.		NS	ddns1.bbc.co.uk.	; 148.163.199.65 2607:f740:e04e:4::1
;  bbc.co.uk. @dns1.bbc.co.uk (198.51.45.9) 6.2 ms [NOERROR qr aa]: answer
dns0.bbc.co.uk.	86400	IN	A	198.51.44.9

;; NAMESERVERS (SOA asked of each address)
;  ddns0.bbc.co.uk [parent+zone]
;    148.163.199.1                           ok                        2026110500  16 ms
;    2607:f740:e04e::1                       ok                        2026110500  16 ms
;  ddns0.bbc.com [parent+zone]
;    148.163.199.129                         ok                        2026110500  16 ms
;    2607:f740:e04e:8::1                     ok                        2026110500  17 ms
;  ddns1.bbc.co.uk [parent+zone]
;    148.163.199.65                          ok                        2026110500  17 ms
;    2607:f740:e04e:4::1                     ok                        2026110500  17 ms
;  ddns1.bbc.com [parent+zone]
;    148.163.199.193                         ok                        2026110500  17 ms
;    2607:f740:e04e:c::1                     ok                        2026110500  17 ms
;  dns0.bbc.co.uk [parent+zone]
;    198.51.44.9                             ok                        2026110500  14 ms
;    2620:4d:4000:6259:7:9:0:1               ok                        2026110500  14 ms
;  dns0.bbc.com [parent+zone]
;    198.51.44.73                            ok                        2026110500  14 ms
;    2620:4d:4000:6259:7:9:0:3               ok                        2026110500  14 ms
;  dns1.bbc.co.uk [parent+zone]
;    198.51.45.9                             ok                        2026110500  6.6 ms
;    2a00:edc0:6259:7:9::2                   ok                        2026110500  14 ms
;  dns1.bbc.com [parent+zone]
;    198.51.45.73                            ok                        2026110500  6.7 ms
;    2a00:edc0:6259:7:9::4                   ok                        2026110500  14 ms

;; DNSSEC: unsigned

;; EMAIL
;  DMARC: v=DMARC1;p=reject;aspf=s;adkim=s;pct=100;fo=0;ri=86400; rua=mailto:dmarc_agg@vali.email;

;; HOSTS
;  dns0.bbc.co.uk (the name looked up; nameserver)
;    198.51.44.9                             PTR ns4.demysdns.co.uk, dns1.p09.nsone.net (confirmed)
;    2620:4d:4000:6259:7:9:0:1               PTR dns1.p09.nsone.net, ns4.demysdns.co.uk (confirmed)
;  ddns0.bbc.co.uk (nameserver)
;    148.163.199.1                           PTR ns2.bbcdns.net (confirmed)
;    2607:f740:e04e::1                       PTR none
;  ddns0.bbc.com (nameserver)
;    148.163.199.129                         PTR ns2.bbcdns.net.uk (confirmed)
;    2607:f740:e04e:8::1                     PTR none
;  ddns1.bbc.co.uk (nameserver)
;    148.163.199.65                          PTR ns3.bbcdns.net (confirmed)
;    2607:f740:e04e:4::1                     PTR none
;  ddns1.bbc.com (nameserver)
;    148.163.199.193                         PTR ns3.bbcdns.net.uk (confirmed)
;    2607:f740:e04e:c::1                     PTR none
;  dns0.bbc.com (nameserver)
;    198.51.44.73                            PTR ns6.demysdns.co.uk, dns3.p09.nsone.net (confirmed)
;    2620:4d:4000:6259:7:9:0:3               PTR dns3.p09.nsone.net, ns6.demysdns.co.uk (confirmed)
;  dns1.bbc.co.uk (nameserver)
;    198.51.45.9                             PTR ns5.demysdns.co.uk, dns2.p09.nsone.net (confirmed)
;    2a00:edc0:6259:7:9::2                   PTR dns2.p09.nsone.net, ns5.demysdns.co.uk (confirmed)
;  dns1.bbc.com (nameserver)
;    198.51.45.73                            PTR ns7.demysdns.com, dns4.p09.nsone.net (confirmed)
;    2a00:edc0:6259:7:9::4                   PTR dns4.p09.nsone.net, ns7.demysdns.com (confirmed)

;; PUBLIC RESOLVERS
;  Cloudflare A     198.51.44.9  ttl 86400
;  Cloudflare AAAA  2620:4d:4000:6259:7:9:0:1  ttl 86400
;  Cloudflare MX    -
;  Google     A     198.51.44.9  ttl 21600
;  Google     AAAA  2620:4d:4000:6259:7:9:0:1  ttl 21600
;  Google     MX    -
;  Quad9      A     198.51.44.9  ttl 31517
;  Quad9      AAAA  2620:4d:4000:6259:7:9:0:1  ttl 33785
;  Quad9      MX    -
;  OpenDNS    A     198.51.44.9  ttl 86400
;  OpenDNS    AAAA  2620:4d:4000:6259:7:9:0:1  ttl 86400
;  OpenDNS    MX    -