zf.com

.com generic · CSC Corporate Domains, Inc. · expires 2027-03-13

Found

TLD

.com (generic)

ICANN policies apply

yes

Registrar

CSC Corporate Domains, Inc.

Registered

12 March 1996

Last changed

9 March 2026

Expires

13 March 2027

Status

client transfer prohibited

Registry nameservers

dns1.p04.nsone.net, dns2.p04.nsone.net, dns3.p04.nsone.net, dns4.p04.nsone.net

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 2027-03-13 #3

  The registration is valid until 2027-03-13 (141 days).
• ✓ Transfer locked #4

  Registry status: client transfer prohibited.
• ✓ Registry and delegation match #5

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

dns1.p04.nsone.net, dns2.p04.nsone.net, dns3.p04.nsone.net, dns4.p04.nsone.net

Found

Parent zone

com

Delegation from

a.gtld-servers.net (192.5.6.30)

NS at the parent

dns1.p04.nsone.net, dns2.p04.nsone.net, dns3.p04.nsone.net, dns4.p04.nsone.net

NS in the zone

dns1.p04.nsone.net, dns2.p04.nsone.net, dns3.p04.nsone.net, dns4.p04.nsone.net

Checks

• ✓ 4 nameservers #6

  Delegated to dns1.p04.nsone.net, dns2.p04.nsone.net, dns3.p04.nsone.net, dns4.p04.nsone.net.
• ✓ 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 2 IPv4 /24s and 2 IPv6 /48s.
• i

  All nameservers in one AS

  All nameserver addresses are announced by one network operator (AS62597 (NSONE - NSONE Inc, 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
• i

  All nameserver names under .net

  All nameserver names are under one TLD, so a problem with that TLD also makes the nameservers unreachable. Some operators use names under two TLDs for extra resilience.

  #12
• ✓ 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: dns1.p04.nsone.net: "19dd46e347df36b70933bf2be8023258586586a9"; dns2.p04.nsone.net: "19dd46e347df36b70933bf2be8023258586586a9"; dns3.p04.nsone.net: "19dd46e347df36b70933bf2be8023258586586a9"; dns4.p04.nsone.net: "19dd46e347df36b70933bf2be8023258586586a9".

  #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 2024032202 · primary ns1.zf.com

Found

Primary (MNAME)

ns1.zf.com

Contact (RNAME)

zf-techc.zf.com

Serial

2024032202

Refresh / retry

3600 s / 900 s

Expire

2419200 s

Negative TTL

900 s

Serial per nameserver

Checks

• ✓ Serial 2024032202 everywhere #22

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

  SOA refresh 1h, retry 15m, expire 28d, negative TTL 15m.
• i

  Hidden master

  The primary nameserver ns1.zf.com 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 zf-techc@zf.com #25

  The SOA RNAME zf-techc.zf.com means zf-techc@zf.com.
• ✓ Date-based serial #26

  The serial 2024032202 follows the YYYYMMDDnn convention (2024-03-22).

29 records at the apex

Found

Read from

198.51.44.4:53

Checks

• ✓ TTLs within range #32

  TTLs: A 4h, MX 4h, NS 4h. The NS TTL at the parent is 2d and in the zone 4h; 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