norton.com

.com generic · MarkMonitor Inc. · expires 2028-09-16

Found

TLD

.com (generic)

ICANN policies apply

yes

Registrar

MarkMonitor Inc.

Registered

17 September 1991

Last changed

15 August 2026

Expires

16 September 2028

Status

client delete prohibited, client transfer prohibited, client update prohibited, server delete prohibited, server transfer prohibited, server update prohibited

Registry nameservers

edns109.ultradns.biz, edns109.ultradns.com, edns109.ultradns.net, edns109.ultradns.org

RDAP server

https://rdap.verisign.com/com/v1/

Checks

• i

  .com is a generic TLD (gTLD)

  Generic TLD under an ICANN registry agreement: ICANN-accredited registrars, UDRP and RDAP apply.

  #1
• ✓ TLD delegated and signed #2

  .com is delegated in the root zone and DNSSEC-signed.
• ✓ Expires on 2028-09-16 #3

  The registration is valid until 2028-09-16 (694 days).
• ✓ Transfer locked #4

  Registry status: client delete prohibited, client transfer prohibited, client update prohibited, server delete prohibited, server transfer prohibited, server update prohibited.
• ✓ Registry and delegation match #5

  The nameservers registered at the registry are the ones published in DNS.

edns109.ultradns.biz, edns109.ultradns.com, edns109.ultradns.net, edns109.ultradns.org

Found

Parent zone

com

Delegation from

a.gtld-servers.net (192.5.6.30)

NS at the parent

edns109.ultradns.biz, edns109.ultradns.com, edns109.ultradns.net, edns109.ultradns.org

NS in the zone

edns109.ultradns.biz, edns109.ultradns.com, edns109.ultradns.net, edns109.ultradns.org

Checks

• ✓ 4 nameservers #6

  Delegated to edns109.ultradns.biz, edns109.ultradns.com, edns109.ultradns.net, edns109.ultradns.org.
• ✓ Parent and zone agree #7

  The parent delegation and the zone's NS records list the same nameservers.
• ✓ No glue needed #8

  All nameservers are outside the zone, so no glue records are needed.
• ✓ All names resolve #9

  Every nameserver name has an address and is not an alias.
• ✓ Nameservers in different networks #10

  The nameservers are spread over 4 IPv4 /24s and 4 IPv6 /48s.
• i

  All nameservers in one AS

  All nameserver addresses are announced by one network operator (AS12008 (VERCARA - Vercara, LLC, US): 8 addresses). An outage or attack on that network affects all nameservers; large anycast providers mitigate this, but a secondary DNS provider adds independence.

  #11
• ✓ Nameserver names under 4 TLDs #12

  Nameserver names use the TLDs .biz, .com, .net, .org.
• ✓ All reachable over IPv6 #13

  Every nameserver has an IPv6 address.

8 of 8 addresses answer authoritatively

Found

Checks

• ✓ All respond #14

  All 8 nameserver addresses answered.
• ✓ All authoritative #15

  Every responding nameserver answers authoritatively for the zone.
• ✓ No recursion #16

  The nameservers do not answer recursive queries for other domains.
• i

  Identifying string disclosed

  These nameservers answer version queries with a string that is not a version number: edns109.ultradns.biz: "UltraDNS Nameserver"; edns109.ultradns.com: "UltraDNS Nameserver"; edns109.ultradns.net: "UltraDNS Nameserver"; edns109.ultradns.org: "UltraDNS Nameserver".

  #17
• ✓ Zone transfers refused #18

  No nameserver allows a zone transfer to the public.
• ✓ TCP supported #19

  All nameservers answer over TCP.
• ✓ EDNS supported #20

  All nameservers support EDNS(0).
• ✓ Public addresses #21

  All nameserver addresses are publicly routable.

serial 2015037834 · primary pdns1.ultradns.net

Found

Primary (MNAME)

pdns1.ultradns.net

Contact (RNAME)

domains.nortonlifelock.com

Serial

2015037834

Refresh / retry

86400 s / 7200 s

Expire

1209600 s

Negative TTL

86400 s

Serial per nameserver

Checks

• ✓ Serial 2015037834 everywhere #22

  All nameservers serve the same version of the zone.
• ✓ Timers within recommendations #23

  SOA refresh 1d, retry 2h, expire 14d, negative TTL 1d.
• i

  Hidden master

  The primary nameserver pdns1.ultradns.net is not listed as a nameserver: a hidden master that only feeds the public secondaries. That is a common setup; make sure it is not reachable for zone transfers from outside.

  #24
• ✓ Contact domains@nortonlifelock.com #25

  The SOA RNAME domains.nortonlifelock.com means domains@nortonlifelock.com.
• ✓ Timestamp serial #26

  The serial 2015037834 is a Unix timestamp (2033-11-08 04:43 UTC).

Signed, DS published at parent

Found

Validated by resolver

yes

Denial of existence

NSEC

Signatures valid until

1 November 2026

DS at the parent

DNSKEY in the zone

Checks

• ✓ Signed and validated #27

  The zone is signed, the parent publishes a DS record, and the resolver validates the answers.
• ✓ DS matches a key #28

  The DS record at the parent matches a key in the zone: key tag 21106 (SHA256).
• ✓ Modern algorithms #29

  Key algorithms: ECDSAP256SHA256 (13).
• ✓ Signatures valid until 2026-11-01 #30

  The earliest DNSKEY/SOA signature expires at 2026-11-01 11:30 UTC.
• i

  NSEC

  The zone uses NSEC, so its full contents can be listed by walking the NSEC chain. That is fine unless the names are sensitive.

  #31

27 records at the apex

Found

Read from

204.74.67.109:53

Checks

• ✓ TTLs within range #32

  TTLs: A 8h, MX 1h, NS 10m. The NS TTL at the parent is 2d and in the zone 10m; resolvers may use either.
• ✓ No CNAME at the apex #33

  The zone apex has no CNAME record.
• ✓ No wildcard #34

  Names that don't exist return NXDOMAIN.
• i

  No CAA records

  Without CAA records any certificate authority may issue certificates for this domain. A CAA record limits issuance to the CAs you use.

  #35