nginx.com

Checked 22 October 2026, 10:03 UTC · via 8.8.8.8
!Passed with warnings
24 passed 1 warning 0 failed 6 info

Registration

info

.com generic · CSC Corporate Domains, Inc. · expires 2026-12-23

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
CSC Corporate Domains, Inc.
Registered
23 December 2004
Last changed
19 December 2025
Expires
23 December 2026
Status
client transfer prohibited
Registry nameservers
ns1.f5clouddns.com, ns2.f5clouddns.com
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 2026-12-23 #3
    The registration is valid until 2026-12-23 (62 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

info

ns1.f5clouddns.com, ns2.f5clouddns.com

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
ns1.f5clouddns.com, ns2.f5clouddns.com
NS in the zone
ns1.f5clouddns.com, ns2.f5clouddns.com
NameserverAddressesNetwork (AS)Glue
ns1.f5clouddns.com107.162.234.197 2604:e180:1071::3:1AS55002 DEFENSE-NET - F5, Inc., US AS55002 DEFENSE-NET - F5, Inc., US107.162.234.197 2604:e180:1071::3:1
ns2.f5clouddns.com107.162.176.221 2604:e180:1071::ffff:6ba2:b0ddAS55002 DEFENSE-NET - F5, Inc., US AS55002 DEFENSE-NET - F5, Inc., US107.162.176.221 2604:e180:1071::ffff:6ba2:b0dd

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: ns1.f5clouddns.com, ns2.f5clouddns.com.
    #6
  • ✓ 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.
  • i
    One address family in one network
    all IPv6 addresses are in 2604:e180:1071::/48, while the other address family is spread over several networks.
    #10
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS55002 (DEFENSE-NET - F5, Inc., US): 4 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 .com
    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

pass

4 of 4 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns1.f5clouddns.com 107.162.234.197NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns1.f5clouddns.com 2604:e180:1071::3:1NOERROR, 205 ms, authoritativenoyes / yesrefused-
ns2.f5clouddns.com 107.162.176.221NOERROR, 10 ms, authoritativenoyes / yesrefused-
ns2.f5clouddns.com 2604:e180:1071::ffff:6ba2:b0ddNOERROR, 59 ms, authoritativenoyes / yesrefused-

Checks

  • ✓ All respond #14
    All 4 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.
  • ✓ No version disclosed #17
    The nameservers don't reveal their software version.
  • ✓ 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 2025051995 · primary ns1.f5clouddns.com

Found

Primary (MNAME)
ns1.f5clouddns.com
Contact (RNAME)
f5xc-dns.f5.com
Serial
2025051995
Refresh / retry
28800 s / 7200 s
Expire
604800 s
Negative TTL
86400 s

Serial per nameserver

NameserverSerial
ns1.f5clouddns.com (107.162.234.197)2025051995
ns1.f5clouddns.com (2604:e180:1071::3:1)2025051995
ns2.f5clouddns.com (107.162.176.221)2025051995
ns2.f5clouddns.com (2604:e180:1071::ffff:6ba2:b0dd)2025051995

Checks

  • ✓ Serial 2025051995 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 8h, retry 2h, expire 7d, negative TTL 1d.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns1.f5clouddns.com is one of the listed nameservers.
  • ✓ Contact f5xc-dns@f5.com #25
    The SOA RNAME f5xc-dns.f5.com means f5xc-dns@f5.com.
  • ✓ Date-based serial #26
    The serial 2025051995 follows the YYYYMMDDnn convention (2025-05-19).

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

info

17 records at the apex

Found

Read from
107.162.234.197:53
TypeValueTTL
SOAns1.f5clouddns.com. f5xc-dns.f5.com. 2025051995 28800 7200 604800 86400600
NSns2.f5clouddns.com.86400
NSns1.f5clouddns.com.86400
A159.60.134.0600
MX10 mx2.hc5801-97.iphmx.com.600
MX10 mx1.hc5801-97.iphmx.com.600
TXT"google-site-verification=Q2uo9nRIztLd374gimJdAb-Bfkw-MdywUFjH59AAkeE"300
TXT"google-site-verification=uUuJd81gBFhTSzGpOtmzRFJndx0uHcICLcicMmjP_eQ"300
TXT"v=spf1 ip4:104.219.104.14 ip4:104.219.105.14 ip4:104.219.106.14 ip4:104.219.107.14 include:spf.protection.outlook.com exists:%{i}.spf.hc5801-97.iphmx.com ~all"300
TXT"citrix-verification-code=7e4cb6c1-154c-48ed-bdfa-65d310d86ec1"300
TXT"google-site-verification=m76lJj_wpFCOdcQ91QngVK7pk83_xTMtIp9m0Vi8qjQ"300
TXT"dropbox-domain-verification=gl56nwvh4szl"300
TXT"docusign=ec7fb56d-ee75-4979-b3e5-10bfbff0ab9e"300
TXT"atlassian-domain-verification=Iv/Cm1UielF25k9FOYOH+QWS9iqMJUFKzUNVB9RqH3uwzIEPziCRKryf2/dKbws8"300
TXT"libera-verification=libera-RDmNyEJHyhbWgEZwNf3L9fUN"300
TXT"MS=ms49391549"300
TXT"google-site-verification=JrwNJWq0sLGx6H5Voxu-bQyH6-Fj6ifMzyNzIppraFc"300

Checks

  • ✓ TTLs within range #32
    TTLs: A 10m, MX 10m, NS 1d. The NS TTL at the parent is 2d and in the zone 1d; 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