jumbo.com

Checked 22 October 2026, 09:25 UTC · via 8.8.8.8
!Passed with warnings
23 passed 4 warnings 0 failed 4 info

Registration

info

.com generic · Tucows Domains Inc. · expires 2027-04-16

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
Tucows Domains Inc.
Registered
15 April 1995
Last changed
20 August 2026
Expires
16 April 2027
Status
client transfer prohibited, client update prohibited
Registry nameservers
a1-133.akam.net, a10-66.akam.net, a11-67.akam.net, a16-64.akam.net, a22-65.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 2027-04-16 #3
    The registration is valid until 2027-04-16 (175 days).
  • ✓ Transfer locked #4
    Registry status: 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

a1-133.akam.net, a10-66.akam.net, a11-67.akam.net, a16-64.akam.net, a22-65.akam.net, a7-66.akam.net

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
a1-133.akam.net, a10-66.akam.net, a11-67.akam.net, a16-64.akam.net, a22-65.akam.net, a7-66.akam.net
NS in the zone
a1-133.akam.net, a10-66.akam.net, a11-67.akam.net, a16-64.akam.net, a22-65.akam.net, a7-66.akam.net
NameserverAddressesNetwork (AS)Glue
a1-133.akam.net193.108.91.133 2600:1401:2::85AS20940 AKAMAI-ASN1 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a10-66.akam.net96.7.50.66 2600:1480:d000::42AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a11-67.akam.net84.53.139.67 2600:1480:1::43AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a16-64.akam.net23.211.132.64 2600:1406:1b::40AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a22-65.akam.net23.211.61.65 2600:1480:7800::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 a1-133.akam.net, a10-66.akam.net, a11-67.akam.net, a16-64.akam.net, a22-65.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.
  • ✓ 2 autonomous systems #11
    The nameservers are spread over: AS20940 (AKAMAI-ASN1 - Akamai International B.V., NL): 1 address; AS21342 (AKAMAI-ASN2 - Akamai International B.V., NL): 11 addresses.
  • 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
a1-133.akam.net 193.108.91.133NOERROR, 3 ms, authoritativenoyes / yesrefused41824.6
a1-133.akam.net 2600:1401:2::85NOERROR, 3 ms, authoritativenoyes / yesrefused41824.10
a10-66.akam.net 96.7.50.66NOERROR, 3 ms, authoritativenoyes / yesrefused48878.27
a10-66.akam.net 2600:1480:d000::42NOERROR, 4 ms, authoritativenoyes / yesrefused48878.33
a11-67.akam.net 84.53.139.67NOERROR, 3 ms, authoritativenoyes / yesrefused41824.4
a11-67.akam.net 2600:1480:1::43NOERROR, 4 ms, authoritativenoyes / yesrefused41824.10
a16-64.akam.net 23.211.132.64NOERROR, 3 ms, authoritativenoyes / yesrefused48878.30
a16-64.akam.net 2600:1406:1b::40NOERROR, 4 ms, authoritativenoyes / yesrefused48878.26
a22-65.akam.net 23.211.61.65NOERROR, 4 ms, authoritativenoyes / yesrefused48878.32
a22-65.akam.net 2600:1480:7800::41NOERROR, 4 ms, authoritativenoyes / yesrefused48878.29
a7-66.akam.net 23.61.199.66NOERROR, 4 ms, authoritativenoyes / yesrefused41824.5
a7-66.akam.net 2600:1406:32::42NOERROR, 4 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: a1-133.akam.net: "41824.6"; a1-133.akam.net: "41824.10"; a10-66.akam.net: "48878.27"; a10-66.akam.net: "48878.33"; a11-67.akam.net: "41824.4"; a11-67.akam.net: "41824.10"; a16-64.akam.net: "48878.30"; a16-64.akam.net: "48878.26"; a22-65.akam.net: "48878.32"; a22-65.akam.net: "48878.29"; a7-66.akam.net: "41824.5"; 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

warn

serial 2021051126 · primary ns1.jumbo.com

Found

Primary (MNAME)
ns1.jumbo.com
Contact (RNAME)
hostmaster.jumbo.com
Serial
2021051126
Refresh / retry
1800 s / 3600 s
Expire
604800 s
Negative TTL
38400 s

Serial per nameserver

NameserverSerial
a1-133.akam.net (193.108.91.133)2021051126
a1-133.akam.net (2600:1401:2::85)2021051126
a10-66.akam.net (96.7.50.66)2021051126
a10-66.akam.net (2600:1480:d000::42)2021051126
a11-67.akam.net (84.53.139.67)2021051126
a11-67.akam.net (2600:1480:1::43)2021051126
a16-64.akam.net (23.211.132.64)2021051126
a16-64.akam.net (2600:1406:1b::40)2021051126
a22-65.akam.net (23.211.61.65)2021051126
a22-65.akam.net (2600:1480:7800::41)2021051126
a7-66.akam.net (23.61.199.66)2021051126
a7-66.akam.net (2600:1406:32::42)2021051126

Checks

  • ✓ Serial 2021051126 everywhere #22
    All nameservers serve the same version of the zone.
  • !
    Unusual SOA timers
    retry 1h should be shorter than refresh 30m. Current values: refresh 30m, retry 1h, expire 7d, negative TTL 640m.
    #23
  • i
    Hidden master
    The primary nameserver ns1.jumbo.com is not listed as a nameserver: a hidden master that only feeds the public secondaries. That is a common setup; make sure it is not reachable for zone transfers from outside.
    #24
  • ✓ Contact hostmaster@jumbo.com #25
    The SOA RNAME hostmaster.jumbo.com means hostmaster@jumbo.com.
  • ✓ Date-based serial #26
    The serial 2021051126 follows the YYYYMMDDnn convention (2021-05-11).

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

25 records at the apex

Found

Read from
193.108.91.133:53
TypeValueTTL
SOAns1.jumbo.com. hostmaster.jumbo.com. 2021051126 1800 3600 604800 38400900
NSa11-67.akam.net.900
NSa7-66.akam.net.900
NSa10-66.akam.net.900
NSa22-65.akam.net.900
NSa1-133.akam.net.900
NSa16-64.akam.net.900
A104.101.249.14820
MX0 jumbo-com.mail.protection.outlook.com.900
TXT"google-site-verification=uv5cV6xUBvW6JIMq7JGQaU5Kj2XPAN0pZz_ybkNz1C4"900
TXT"google-site-verification=-3EsyucOmnZkFpxznMfhluNsThX1Z74UqWUfYMXMlJ8"900
TXT"facebook-domain-verification=kmaek0khe9vp3sc9upvof32lli1yhz"900
TXT"yPUt7RsaUWvDeFjfuCPyUBDdK9KwoKIM2TVvdazngepkKkr1uczUUXewx9Pa4l+/XwLb9Ym6lraPT994SNNPPA=="900
TXT"atlassian-domain-verification=EcqlCXT/DbaGn0i9IJRn4zDdWysTz5TEjoVh79emqAYgV2xuZFvLINFp5BL6vHJ6"900
TXT"tiktok-developers-site-verification=2aob6BA1nBQJmEssfGpspCwe2ltj3VI4"900
TXT"docusign=210744d1-1e53-4969-a27e-51508d22c340"900
TXT"docker-verification=354ec55e-9a19-485c-a911-58ea4ae62916"900
TXT"anthropic-domain-verification-w8hcgw=3K0LAQZUBvvjb1ljqqmYuEQzk"900
TXT"apple-domain-verification=8ZDCtp6wupZrwze5"900
TXT"v=spf1 include:_spf.profils.org include:_spf.mailer.twinfield.com include:_spf.salesforce.com include:spf.emsecure.net include:spf.protection.outlook.com include:_spf.mailplus.nl" " include:lms.plusport.com include:amazonses.com ip4:31.22.81.64/27 ip4:213.201.239.247 ip4:212.72.56.25 ip4:54.229.227.102 ip4:95.211.247.191 ip4:195.137.242.240" " ip4:188.166.23.86 ip4:188.166.23.99 ip4:82.94.210.0/24 ip4:51.138.2.212 ip4:51.138.5.201 -all"900
TXT"docusign=e18e908c-8e54-4515-82f9-fee2147e2d5f"900
TXT"onetrust-domain-verification=21b85d5122cc410b96938b6037691546"900
TXT"mongodb-site-verification=EJ0sJJGAD2q46946xXel1AcXFwlKJhZP"900
TXT"openai-domain-verification=dv-1WrKNR2vWmmDu1piMPIYfVVQ"900
TXT"MS=ms35472116"900

Checks

  • !
    Very low TTLs
    These records have a TTL below 5m, causing extra queries and slower lookups: A (20s). Low TTLs are useful just before a planned change. The NS TTL at the parent is 2d and in the zone 15m; 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