serif.com

Checked 22 October 2026, 10:40 UTC · via 8.8.8.8
!Passed with warnings
27 passed 2 warnings 0 failed 2 info

Registration

info

.com generic · Gandi SAS · expires 2027-03-05

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
Gandi SAS
Registered
4 March 1995
Last changed
29 January 2026
Expires
5 March 2027
Status
client transfer prohibited
Registry nameservers
ns-1444.awsdns-52.org, ns-1631.awsdns-11.co.uk, ns-239.awsdns-29.com, ns-773.awsdns-32.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 2027-03-05 #3
    The registration is valid until 2027-03-05 (133 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

ns-1444.awsdns-52.org, ns-1631.awsdns-11.co.uk, ns-239.awsdns-29.com, ns-773.awsdns-32.net

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
ns-1444.awsdns-52.org, ns-1631.awsdns-11.co.uk, ns-239.awsdns-29.com, ns-773.awsdns-32.net
NS in the zone
ns-1444.awsdns-52.org, ns-1631.awsdns-11.co.uk, ns-239.awsdns-29.com, ns-773.awsdns-32.net
NameserverAddressesNetwork (AS)Glue
ns-1444.awsdns-52.org205.251.197.164 2600:9000:5305:a400::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US-
ns-1631.awsdns-11.co.uk205.251.198.95 2600:9000:5306:5f00::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US-
ns-239.awsdns-29.com205.251.192.239 2600:9000:5300:ef00::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US205.251.192.239 2600:9000:5300:ef00::1
ns-773.awsdns-32.net205.251.195.5 2600:9000:5303:500::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US-

Checks

  • ✓ 4 nameservers #6
    Delegated to ns-1444.awsdns-52.org, ns-1631.awsdns-11.co.uk, ns-239.awsdns-29.com, ns-773.awsdns-32.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 4 IPv4 /24s and 4 IPv6 /48s.
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS16509 (AMAZON-02 - Amazon.com, 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
  • ✓ Nameserver names under 4 TLDs #12
    Nameserver names use the TLDs .com, .net, .org, .uk.
  • ✓ All reachable over IPv6 #13
    Every nameserver has an IPv6 address.

Nameservers

pass

8 of 8 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns-1444.awsdns-52.org 205.251.197.164NOERROR, 3 ms, authoritativenoyes / yesrefused-
ns-1444.awsdns-52.org 2600:9000:5305:a400::1NOERROR, 4 ms, authoritativenoyes / yesrefused-
ns-1631.awsdns-11.co.uk 205.251.198.95NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns-1631.awsdns-11.co.uk 2600:9000:5306:5f00::1NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns-239.awsdns-29.com 205.251.192.239NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns-239.awsdns-29.com 2600:9000:5300:ef00::1NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns-773.awsdns-32.net 205.251.195.5NOERROR, 3 ms, authoritativenoyes / yesrefused-
ns-773.awsdns-32.net 2600:9000:5303:500::1NOERROR, 4 ms, authoritativenoyes / yesrefused-

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.
  • ✓ 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 1 · primary ns-239.awsdns-29.com

Found

Primary (MNAME)
ns-239.awsdns-29.com
Contact (RNAME)
awsdns-hostmaster.amazon.com
Serial
1
Refresh / retry
7200 s / 900 s
Expire
1209600 s
Negative TTL
86400 s

Serial per nameserver

NameserverSerial
ns-1444.awsdns-52.org (205.251.197.164)1
ns-1444.awsdns-52.org (2600:9000:5305:a400::1)1
ns-1631.awsdns-11.co.uk (205.251.198.95)1
ns-1631.awsdns-11.co.uk (2600:9000:5306:5f00::1)1
ns-239.awsdns-29.com (205.251.192.239)1
ns-239.awsdns-29.com (2600:9000:5300:ef00::1)1
ns-773.awsdns-32.net (205.251.195.5)1
ns-773.awsdns-32.net (2600:9000:5303:500::1)1

Checks

  • ✓ Serial 1 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 2h, retry 15m, expire 14d, negative TTL 1d.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns-239.awsdns-29.com is one of the listed nameservers.
  • ✓ Contact awsdns-hostmaster@amazon.com #25
    The SOA RNAME awsdns-hostmaster.amazon.com means awsdns-hostmaster@amazon.com.
  • ✓ Counter serial #26
    The serial 1 is a plain counter.

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

warn

26 records at the apex

Found

Read from
205.251.197.164:53
TypeValueTTL
SOAns-239.awsdns-29.com. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400900
NSns-1444.awsdns-52.org.172800
NSns-1631.awsdns-11.co.uk.172800
NSns-239.awsdns-29.com.172800
NSns-773.awsdns-32.net.172800
A13.226.244.3260
A13.226.244.1960
A13.226.244.2860
A13.226.244.7960
AAAA2600:9000:2013:7800:1b:dd85:fb00:93a160
AAAA2600:9000:2013:5a00:1b:dd85:fb00:93a160
AAAA2600:9000:2013:6400:1b:dd85:fb00:93a160
AAAA2600:9000:2013:800:1b:dd85:fb00:93a160
AAAA2600:9000:2013:d600:1b:dd85:fb00:93a160
AAAA2600:9000:2013:c200:1b:dd85:fb00:93a160
AAAA2600:9000:2013:6200:1b:dd85:fb00:93a160
AAAA2600:9000:2013:c600:1b:dd85:fb00:93a160
MX0 serif-com.mail.protection.outlook.com.300
TXT"apple-domain-verification=NtYHBdsgrv4gkxJ7" "facebook-domain-verification=269nx2pn7mvgwdxxuvshoilrr7wg83" "google-site-verification=lpQ50EcQdhn-zzbs0IqbV7TvYtEvBAbrRDfWwWb9zKY" "spycloud-domain-verification=832a3d70-f123-4e06-a135-6c9cc85b6d30"60
TXT"atlassian-domain-verification=rie8jGbQjxwFnUfEJ5DhYCdtEResa9Vg773/vaE2DtJwnEbS2txPvtfkuKhhLPTI"60
TXT"v=spf1 mx ip4:74.91.88.107 ip4:80.6.91.224/27 ip4:82.3.48.0/26 ip4:82.3.48.64/26 ip4:81.109.165.40/29 include:servers.mcsv.net include:spf.protection.outlook.com include:amazonses.com include:mail.zendesk.com include:143821590.spf10.hubspotemail.net ~all"60
CAA0 iodef "mailto:domains@serif.com"300
CAA0 issue "Digicert.com"300
CAA0 issue "amazon.com"300
CAA0 issue "letsencrypt.org"300
CAA0 issue "pki.goog"300

Checks

  • !
    Very low TTLs
    These records have a TTL below 5m, causing extra queries and slower lookups: A (1m), AAAA (1m). Low TTLs are useful just before a planned change.
    #32
  • ✓ 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, amazon.com, letsencrypt.org, pki.goog.