sierra.com

Checked 22 October 2026, 10:42 UTC · via 8.8.8.8
!Passed with warnings
24 passed 3 warnings 0 failed 4 info

Registration

info

.com generic · MarkMonitor Inc. · expires 2027-09-24

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
MarkMonitor Inc.
Registered
25 September 1991
Last changed
23 August 2025
Expires
24 September 2027
Status
client delete prohibited, client transfer prohibited, client update prohibited
Registry nameservers
a1-117.akam.net, a14-66.akam.net, a18-67.akam.net, a22-64.akam.net, a5-65.akam.net, a7-66.akam.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 2027-09-24 #3
    The registration is valid until 2027-09-24 (336 days).
  • ✓ Transfer locked #4
    Registry status: client delete prohibited, client transfer prohibited, client update prohibited.
  • ✓ Registry and delegation match #5
    The nameservers registered at the registry are the ones published in DNS.

Delegation

info

a1-117.akam.net, a14-66.akam.net, a18-67.akam.net, a22-64.akam.net, a5-65.akam.net, a7-66.akam.net

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
a1-117.akam.net, a14-66.akam.net, a18-67.akam.net, a22-64.akam.net, a5-65.akam.net, a7-66.akam.net
NS in the zone
a1-117.akam.net, a14-66.akam.net, a18-67.akam.net, a22-64.akam.net, a5-65.akam.net, a7-66.akam.net
NameserverAddressesNetwork (AS)Glue
a1-117.akam.net193.108.91.117 2600:1401:2::75AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a14-66.akam.net184.26.161.66 2600:1480:1800::42AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a18-67.akam.net95.101.36.67 2600:1480:4800::43AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a22-64.akam.net23.211.61.64 2600:1480:7800::40AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a5-65.akam.net95.100.168.65 2600:1480:b000::41AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a7-66.akam.net23.61.199.66 2600:1406:32::42AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-

Checks

  • ✓ 6 nameservers #6
    Delegated to a1-117.akam.net, a14-66.akam.net, a18-67.akam.net, a22-64.akam.net, a5-65.akam.net, a7-66.akam.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 6 IPv4 /24s and 6 IPv6 /48s.
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS21342 (AKAMAI-ASN2 - Akamai International B.V., NL): 12 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

warn

12 of 12 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
a1-117.akam.net 193.108.91.117NOERROR, 3 ms, authoritativenoyes / yesrefused41824.10
a1-117.akam.net 2600:1401:2::75NOERROR, 3 ms, authoritativenoyes / yesrefused41824.8
a14-66.akam.net 184.26.161.66NOERROR, 3 ms, authoritativenoyes / yesrefused48878.30
a14-66.akam.net 2600:1480:1800::42NOERROR, 7 ms, authoritativenoyes / yesrefused48878.31
a18-67.akam.net 95.101.36.67NOERROR, 3 ms, authoritativenoyes / yesrefused48878.30
a18-67.akam.net 2600:1480:4800::43NOERROR, 3 ms, authoritativenoyes / yesrefused48878.32
a22-64.akam.net 23.211.61.64NOERROR, 8 ms, authoritativenoyes / yesrefused48878.31
a22-64.akam.net 2600:1480:7800::40NOERROR, 8 ms, authoritativenoyes / yesrefused48878.29
a5-65.akam.net 95.100.168.65NOERROR, 4 ms, authoritativenoyes / yesrefused41824.7
a5-65.akam.net 2600:1480:b000::41NOERROR, 7 ms, authoritativenoyes / yesrefused41824.8
a7-66.akam.net 23.61.199.66NOERROR, 7 ms, authoritativenoyes / yesrefused41824.8
a7-66.akam.net 2600:1406:32::42NOERROR, 8 ms, authoritativenoyes / yesrefused41824.11

Checks

  • ✓ All respond #14
    All 12 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.
  • !
    Software version disclosed
    These nameservers report their software version via version.bind/version.server, which helps attackers find known vulnerabilities: a1-117.akam.net: "41824.10"; a1-117.akam.net: "41824.8"; a14-66.akam.net: "48878.30"; a14-66.akam.net: "48878.31"; a18-67.akam.net: "48878.30"; a18-67.akam.net: "48878.32"; a22-64.akam.net: "48878.31"; a22-64.akam.net: "48878.29"; a5-65.akam.net: "41824.7"; a5-65.akam.net: "41824.8"; a7-66.akam.net: "41824.8"; a7-66.akam.net: "41824.11". Hide or replace the version string.
    #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 2025011256 · primary a1-117.akam.net

Found

Primary (MNAME)
a1-117.akam.net
Contact (RNAME)
hostmaster.sierra.com
Serial
2025011256
Refresh / retry
3600 s / 600 s
Expire
604800 s
Negative TTL
300 s

Serial per nameserver

NameserverSerial
a1-117.akam.net (193.108.91.117)2025011256
a1-117.akam.net (2600:1401:2::75)2025011256
a14-66.akam.net (184.26.161.66)2025011256
a14-66.akam.net (2600:1480:1800::42)2025011256
a18-67.akam.net (95.101.36.67)2025011256
a18-67.akam.net (2600:1480:4800::43)2025011256
a22-64.akam.net (23.211.61.64)2025011256
a22-64.akam.net (2600:1480:7800::40)2025011256
a5-65.akam.net (95.100.168.65)2025011256
a5-65.akam.net (2600:1480:b000::41)2025011256
a7-66.akam.net (23.61.199.66)2025011256
a7-66.akam.net (2600:1406:32::42)2025011256

Checks

  • ✓ Serial 2025011256 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 1h, retry 10m, expire 7d, negative TTL 5m.
  • ✓ Primary is a public nameserver #24
    The primary nameserver a1-117.akam.net is one of the listed nameservers.
  • ✓ Contact hostmaster@sierra.com #25
    The SOA RNAME hostmaster.sierra.com means hostmaster@sierra.com.
  • ✓ Date-based serial #26
    The serial 2025011256 follows the YYYYMMDDnn convention (2025-01-12).

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

22 records at the apex

Found

Read from
193.108.91.117:53
TypeValueTTL
SOAa1-117.akam.net. hostmaster.sierra.com. 2025011256 3600 600 604800 30086400
NSa14-66.akam.net.86400
NSa18-67.akam.net.86400
NSa7-66.akam.net.86400
NSa5-65.akam.net.86400
NSa1-117.akam.net.86400
NSa22-64.akam.net.86400
A2.16.204.1620
A2.16.204.620
AAAA2a02:26f0:b700:4::210:cc6120
AAAA2a02:26f0:b700:4::210:cc4620
MX10 mxa-00081a02.gslb.pphosted.com.86400
MX10 mxb-00081a02.gslb.pphosted.com.86400
MX20 mx0b-00081a02.pphosted.com.86400
MX20 mx0a-00081a02.pphosted.com.86400
TXT"yahoo-verification-key=YsGxRHqFSre2qGQ8PmxHnXX0wxSjrjT28BMBnJJHLFE="300
TXT"_kbjv48zzq25pmo06y45ibslm7qrplaf"300
TXT"_3lnpisy0k1vhbs5c2wgv5j6edfwa9cd"300
TXT"v=spf1 ip4:205.220.171.102 ip4:205.220.182.205 ip4:205.220.173.171 ip4:205.220.161.171 include:%{ir}.%{v}.%{d}.spf.has.pphosted.com ~all"300
TXT"_8wzzt21jnpzs2xsnuiu4oajf56yo686"300
TXT"google-site-verification=6fDczSvMJO9oJmJNVn12LSPzijhyTUHTlEMSfmHb1r4"300
TXT"_epr8p5ktapw94m9jwqrsaro43krmz0r"300

Checks

  • !
    Very low TTLs
    These records have a TTL below 5m, causing extra queries and slower lookups: A (20s), AAAA (20s). Low TTLs are useful just before a planned change. The NS TTL at the parent is 2d and in the zone 1d; resolvers may use either.
    #32
  • ✓ 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