sprint.com

Checked 22 October 2026, 10:50 UTC · via 8.8.8.8
!Passed with warnings
25 passed 3 warnings 0 failed 3 info

Registration

info

.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 1990
Last changed
9 March 2026
Expires
13 March 2027
Status
client transfer prohibited, server delete prohibited, server transfer prohibited, server update prohibited
Registry nameservers
a1-167.akam.net, a13-67.akam.net, a14-65.akam.net, a6-66.akam.net, a7-65.akam.net, a8-66.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 2027-03-13 #3
    The registration is valid until 2027-03-13 (141 days).
  • ✓ Transfer locked #4
    Registry status: client transfer prohibited, server delete prohibited, server transfer prohibited, server update prohibited.
  • ✓ Registry and delegation match #5
    The nameservers registered at the registry are the ones published in DNS.

Delegation

info

a1-167.akam.net, a13-67.akam.net, a14-65.akam.net, a6-66.akam.net, a7-65.akam.net, a8-66.akam.net

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
a1-167.akam.net, a13-67.akam.net, a14-65.akam.net, a6-66.akam.net, a7-65.akam.net, a8-66.akam.net
NS in the zone
a1-167.akam.net, a13-67.akam.net, a14-65.akam.net, a6-66.akam.net, a7-65.akam.net, a8-66.akam.net
NameserverAddressesNetwork (AS)Glue
a1-167.akam.net193.108.91.167 2600:1401:2::a7AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a13-67.akam.net2.22.230.67 2600:1480:800::43AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a14-65.akam.net184.26.161.65 2600:1480:1800::41AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a6-66.akam.net23.211.133.66 2600:1401:1::42AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a7-65.akam.net23.61.199.65 2600:1406:32::41AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a8-66.akam.net2.16.40.66 2600:1403:a::42AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-

Checks

  • ✓ 6 nameservers #6
    Delegated to a1-167.akam.net, a13-67.akam.net, a14-65.akam.net, a6-66.akam.net, a7-65.akam.net, a8-66.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
a1-167.akam.net 193.108.91.167NOERROR, 4 ms, authoritativenoyes / yesrefused41824.9
a1-167.akam.net 2600:1401:2::a7NOERROR, 4 ms, authoritativenoyes / yesrefused41824.8
a13-67.akam.net 2.22.230.67NOERROR, 6 ms, authoritativenoyes / yesrefused41824.6
a13-67.akam.net 2600:1480:800::43NOERROR, 4 ms, authoritativenoyes / yesrefused41824.8
a14-65.akam.net 184.26.161.65NOERROR, 6 ms, authoritativenoyes / yesrefused48878.29
a14-65.akam.net 2600:1480:1800::41NOERROR, 5 ms, authoritativenoyes / yesrefused48878.27
a6-66.akam.net 23.211.133.66NOERROR, 4 ms, authoritativenoyes / yesrefused48878.33
a6-66.akam.net 2600:1401:1::42NOERROR, 4 ms, authoritativenoyes / yesrefused48878.33
a7-65.akam.net 23.61.199.65NOERROR, 6 ms, authoritativenoyes / yesrefused41824.5
a7-65.akam.net 2600:1406:32::41NOERROR, 7 ms, authoritativenoyes / yesrefused41824.11
a8-66.akam.net 2.16.40.66NOERROR, 4 ms, authoritativenoyes / yesrefused48878.31
a8-66.akam.net 2600:1403:a::42NOERROR, 4 ms, authoritativenoyes / yesrefused48878.30

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: a1-167.akam.net: "41824.9"; a1-167.akam.net: "41824.8"; a13-67.akam.net: "41824.6"; a13-67.akam.net: "41824.8"; a14-65.akam.net: "48878.29"; a14-65.akam.net: "48878.27"; a6-66.akam.net: "48878.33"; a7-65.akam.net: "41824.5"; a7-65.akam.net: "41824.11"; a8-66.akam.net: "48878.31"; a8-66.akam.net: "48878.30". 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 2024082632 · primary a1-167.akam.net

Found

Primary (MNAME)
a1-167.akam.net
Contact (RNAME)
hostmaster.sprint.com
Serial
2024082632
Refresh / retry
3600 s / 600 s
Expire
604800 s
Negative TTL
300 s

Serial per nameserver

NameserverSerial
a1-167.akam.net (193.108.91.167)2024082632
a1-167.akam.net (2600:1401:2::a7)2024082632
a13-67.akam.net (2.22.230.67)2024082632
a13-67.akam.net (2600:1480:800::43)2024082632
a14-65.akam.net (184.26.161.65)2024082632
a14-65.akam.net (2600:1480:1800::41)2024082632
a6-66.akam.net (23.211.133.66)2024082632
a6-66.akam.net (2600:1401:1::42)2024082632
a7-65.akam.net (23.61.199.65)2024082632
a7-65.akam.net (2600:1406:32::41)2024082632
a8-66.akam.net (2.16.40.66)2024082632
a8-66.akam.net (2600:1403:a::42)2024082632

Checks

  • ✓ Serial 2024082632 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 a1-167.akam.net is one of the listed nameservers.
  • ✓ Contact hostmaster@sprint.com #25
    The SOA RNAME hostmaster.sprint.com means hostmaster@sprint.com.
  • ✓ Date-based serial #26
    The serial 2024082632 follows the YYYYMMDDnn convention (2024-08-26).

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

20 records at the apex

Found

Read from
193.108.91.167:53
TypeValueTTL
SOAa1-167.akam.net. hostmaster.sprint.com. 2024082632 3600 600 604800 300300
NSa8-66.akam.net.300
NSa1-167.akam.net.300
NSa7-65.akam.net.300
NSa13-67.akam.net.300
NSa6-66.akam.net.300
NSa14-65.akam.net.300
A2.16.204.3320
A2.16.204.2920
AAAA2a02:26f0:b700:5::210:cc1d20
AAAA2a02:26f0:b700:5::210:cc2120
MX10 sprint-com.mail.protection.outlook.com.300
TXT"v=spf1 include:t-mobile.com -all"300
CAA0 iodef "mailto:pki-admin@t-mobile.com"300
CAA0 issuewild "digicert.com"300
CAA0 issue "sectigo.com"300
CAA0 issue "letsencrypt.org"300
CAA0 issuewild "letsencrypt.org"300
CAA0 issue "digicert.com"300
CAA0 issue "entrust.net"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 5m; 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.
  • ✓ CAA restricts issuance #35
    Certificates may be issued by: digicert.com, sectigo.com, letsencrypt.org, entrust.net.