Domain report: zimbra.com

Registration

info

.com generic · CSC Corporate Domains, Inc. · expires 2027-06-01

Found

TLD: .com (generic)
ICANN policies apply: yes
Registrar: CSC Corporate Domains, Inc.
Registered: 1 June 2001
Last changed: 28 May 2026
Expires: 1 June 2027
Status: client transfer prohibited
Registry nameservers: dns1.p03.nsone.net, dns2.p03.nsone.net, dns3.p03.nsone.net, dns4.p03.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 2027-06-01 #3

The registration is valid until 2027-06-01 (221 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.

Delegation

warn

dns1.p03.nsone.net, dns2.p03.nsone.net, dns3.p03.nsone.net, dns4.p03.nsone.net

Found

Parent zone: com
Delegation from: a.gtld-servers.net (192.5.6.30)
NS at the parent: dns1.p03.nsone.net, dns2.p03.nsone.net, dns3.p03.nsone.net, dns4.p03.nsone.net
NS in the zone: dns1.p05.nsone.net, dns2.p05.nsone.net, dns3.p05.nsone.net, dns4.p05.nsone.net

Nameserver	Addresses	Network (AS)	Glue
dns1.p03.nsone.net (parent only)	198.51.44.3 2620:4d:4000:6259:7:3:0:1	AS62597 NSONE - NSONE Inc, US AS62597 NSONE - NSONE Inc, US	-
dns1.p05.nsone.net (zone only)	198.51.44.5 2620:4d:4000:6259:7:5:0:1	AS62597 NSONE - NSONE Inc, US AS62597 NSONE - NSONE Inc, US	-
dns2.p03.nsone.net (parent only)	198.51.45.3 2a00:edc0:6259:7:3::2	AS62597 NSONE - NSONE Inc, US AS62597 NSONE - NSONE Inc, US	-
dns2.p05.nsone.net (zone only)	198.51.45.5 2a00:edc0:6259:7:5::2	AS62597 NSONE - NSONE Inc, US AS62597 NSONE - NSONE Inc, US	-
dns3.p03.nsone.net (parent only)	198.51.44.67 2620:4d:4000:6259:7:3:0:3	AS62597 NSONE - NSONE Inc, US AS62597 NSONE - NSONE Inc, US	-
dns3.p05.nsone.net (zone only)	198.51.44.69 2620:4d:4000:6259:7:5:0:3	AS62597 NSONE - NSONE Inc, US AS62597 NSONE - NSONE Inc, US	-
dns4.p03.nsone.net (parent only)	198.51.45.67 2a00:edc0:6259:7:3::4	AS62597 NSONE - NSONE Inc, US AS62597 NSONE - NSONE Inc, US	-
dns4.p05.nsone.net (zone only)	198.51.45.69 2a00:edc0:6259:7:5::4	AS62597 NSONE - NSONE Inc, US AS62597 NSONE - NSONE Inc, US	-

Checks

✓ 4 nameservers #6

Delegated to dns1.p03.nsone.net, dns2.p03.nsone.net, dns3.p03.nsone.net, dns4.p03.nsone.net.
!

NS sets differ

The nameservers at the parent and in the zone should be the same. Only at the parent: dns1.p03.nsone.net, dns2.p03.nsone.net, dns3.p03.nsone.net, dns4.p03.nsone.net; only in the zone: dns1.p05.nsone.net, dns2.p05.nsone.net, dns3.p05.nsone.net, dns4.p05.nsone.net. dns1.p03.nsone.net, dns1.p05.nsone.net, dns2.p03.nsone.net, dns2.p05.nsone.net, dns3.p03.nsone.net, dns3.p05.nsone.net, dns4.p03.nsone.net, dns4.p05.nsone.net report NS dns1.p05.nsone.net dns2.p05.nsone.net dns3.p05.nsone.net dns4.p05.nsone.net.

#7
✓ 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): 16 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.

Nameservers

info

16 of 16 addresses answer authoritatively

Found

Nameserver	Answer	Recursion	TCP / EDNS	AXFR	Version
dns1.p03.nsone.net 198.51.44.3	NOERROR, 4 ms, authoritative	no	yes / yes	refused	19dd46e347df36b70933bf2be8023258586586a9
dns1.p03.nsone.net 2620:4d:4000:6259:7:3:0:1	NOERROR, 7 ms, authoritative	no	yes / yes	refused	19dd46e347df36b70933bf2be8023258586586a9
dns1.p05.nsone.net 198.51.44.5	NOERROR, 5 ms, authoritative	no	yes / yes	refused	19dd46e347df36b70933bf2be8023258586586a9
dns1.p05.nsone.net 2620:4d:4000:6259:7:5:0:1	NOERROR, 5 ms, authoritative	no	yes / yes	refused	19dd46e347df36b70933bf2be8023258586586a9
dns2.p03.nsone.net 198.51.45.3	NOERROR, 5 ms, authoritative	no	yes / yes	refused	19dd46e347df36b70933bf2be8023258586586a9
dns2.p03.nsone.net 2a00:edc0:6259:7:3::2	NOERROR, 5 ms, authoritative	no	yes / yes	refused	19dd46e347df36b70933bf2be8023258586586a9
dns2.p05.nsone.net 198.51.45.5	NOERROR, 5 ms, authoritative	no	yes / yes	refused	19dd46e347df36b70933bf2be8023258586586a9
dns2.p05.nsone.net 2a00:edc0:6259:7:5::2	NOERROR, 4 ms, authoritative	no	yes / yes	refused	19dd46e347df36b70933bf2be8023258586586a9
dns3.p03.nsone.net 198.51.44.67	NOERROR, 6 ms, authoritative	no	yes / yes	refused	19dd46e347df36b70933bf2be8023258586586a9
dns3.p03.nsone.net 2620:4d:4000:6259:7:3:0:3	NOERROR, 5 ms, authoritative	no	yes / yes	refused	19dd46e347df36b70933bf2be8023258586586a9
dns3.p05.nsone.net 198.51.44.69	NOERROR, 5 ms, authoritative	no	yes / yes	refused	19dd46e347df36b70933bf2be8023258586586a9
dns3.p05.nsone.net 2620:4d:4000:6259:7:5:0:3	NOERROR, 7 ms, authoritative	no	yes / yes	refused	19dd46e347df36b70933bf2be8023258586586a9
dns4.p03.nsone.net 198.51.45.67	NOERROR, 3 ms, authoritative	no	yes / yes	refused	19dd46e347df36b70933bf2be8023258586586a9
dns4.p03.nsone.net 2a00:edc0:6259:7:3::4	NOERROR, 4 ms, authoritative	no	yes / yes	refused	19dd46e347df36b70933bf2be8023258586586a9
dns4.p05.nsone.net 198.51.45.69	NOERROR, 4 ms, authoritative	no	yes / yes	refused	19dd46e347df36b70933bf2be8023258586586a9
dns4.p05.nsone.net 2a00:edc0:6259:7:5::4	NOERROR, 4 ms, authoritative	no	yes / yes	refused	19dd46e347df36b70933bf2be8023258586586a9

Checks

✓ All respond #14

All 16 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.p03.nsone.net: "19dd46e347df36b70933bf2be8023258586586a9"; dns1.p05.nsone.net: "19dd46e347df36b70933bf2be8023258586586a9"; dns2.p03.nsone.net: "19dd46e347df36b70933bf2be8023258586586a9"; dns2.p05.nsone.net: "19dd46e347df36b70933bf2be8023258586586a9"; dns3.p03.nsone.net: "19dd46e347df36b70933bf2be8023258586586a9"; dns3.p05.nsone.net: "19dd46e347df36b70933bf2be8023258586586a9"; dns4.p03.nsone.net: "19dd46e347df36b70933bf2be8023258586586a9"; dns4.p05.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.

SOA

pass

serial 1653325197 · primary dns1.p05.nsone.net

Found

Primary (MNAME): dns1.p05.nsone.net
Contact (RNAME): hostmaster.nsone.net
Serial: 1653325197
Refresh / retry: 3600 s / 600 s
Expire: 604800 s
Negative TTL: 3600 s

Serial per nameserver

Nameserver	Serial
dns1.p03.nsone.net (198.51.44.3)	1653325197
dns1.p03.nsone.net (2620:4d:4000:6259:7:3:0:1)	1653325197
dns1.p05.nsone.net (198.51.44.5)	1653325197
dns1.p05.nsone.net (2620:4d:4000:6259:7:5:0:1)	1653325197
dns2.p03.nsone.net (198.51.45.3)	1653325197
dns2.p03.nsone.net (2a00:edc0:6259:7:3::2)	1653325197
dns2.p05.nsone.net (198.51.45.5)	1653325197
dns2.p05.nsone.net (2a00:edc0:6259:7:5::2)	1653325197
dns3.p03.nsone.net (198.51.44.67)	1653325197
dns3.p03.nsone.net (2620:4d:4000:6259:7:3:0:3)	1653325197
dns3.p05.nsone.net (198.51.44.69)	1653325197
dns3.p05.nsone.net (2620:4d:4000:6259:7:5:0:3)	1653325197
dns4.p03.nsone.net (198.51.45.67)	1653325197
dns4.p03.nsone.net (2a00:edc0:6259:7:3::4)	1653325197
dns4.p05.nsone.net (198.51.45.69)	1653325197
dns4.p05.nsone.net (2a00:edc0:6259:7:5::4)	1653325197

Checks

✓ Serial 1653325197 everywhere #22

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

SOA refresh 1h, retry 10m, expire 7d, negative TTL 1h.
✓ Primary is a public nameserver #24

The primary nameserver dns1.p05.nsone.net is one of the listed nameservers.
✓ Contact hostmaster@nsone.net #25

The SOA RNAME hostmaster.nsone.net means hostmaster@nsone.net.
✓ Timestamp serial #26

The serial 1653325197 is a Unix timestamp (2022-05-23 16:59 UTC).

DNSSEC

warn

Not signed

Found

Validated by resolver: no

Checks

!

Not signed

The zone is not signed with DNSSEC, so answers can be spoofed. Enable DNSSEC at your DNS provider and publish the DS record at your registrar.

#27

Records

pass

15 records at the apex

Found

Read from: 198.51.44.3:53

Type	Value	TTL
SOA	dns1.p05.nsone.net. hostmaster.nsone.net. 1653325197 3600 600 604800 3600	3600
NS	dns1.p05.nsone.net.	3600
NS	dns2.p05.nsone.net.	3600
NS	dns3.p05.nsone.net.	3600
NS	dns4.p05.nsone.net.	3600
A	23.185.0.2	3600
AAAA	2620:12a:8000::2	1800
AAAA	2620:12a:8001::2	1800
MX	10 us-smtp-inbound-1.mimecast.com.	300
MX	10 us-smtp-inbound-2.mimecast.com.	300
TXT	"v=spf1 ptr mx ip4:52.7.157.95 ip4:52.70.125.224 ip4:52.204.246.185 ip4:52.205.85.65 ip4:66.64.15.66 ip4:167.89.32.168 ip4:173.227.76.247 ip4:14.141.104.38 ip4:193.122.206.174 ip4:193.122.199.60 ip4:129.213.200.110 ip4:150.136.98.232 ip4:150.136.146.2 ip4:" "129.80.213.239 ip4:193.122.157.30 ip4:141.148.3.168 ip4:129.213.104.172 ip4:193.122.141.196/32 ip4:150.136.208.81/32 include:us._netblocks.mimecast.com include:_spf.salesforce.com include:212115.spf01.hubspotemail.net include:4366039.spf01.hubspotemail.ne" "t -all"	300
TXT	"cisco-ci-domain-verification=681f562fa07c58c993c8bfde487542cb70b5b5eef7753e423d2ff666ce4f33b5" "linkedin-site-verification=ae9a3118-fc72-40a5-9e5a-246a2fda8ebc" "0ed1fe018af82aa0df68164d5ebf2117796408d42c" "hubspot-8kdO401Z9UEt"	300
CAA	0 issue "digicert.com"	3600
CAA	0 issue "letsencrypt.org"	3600
CAA	0 issue "pki.goog; cansignhttpexchanges=yes"	3600

Checks

✓ TTLs within range #32

TTLs: A 1h, AAAA 30m, MX 5m, NS 1h. The NS TTL at the parent is 2d and in the zone 1h; 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.
✓ CAA restricts issuance #35

Certificates may be issued by: digicert.com, letsencrypt.org, pki.goog.