mayoclinic.com

Checked 22 October 2026, 09:43 UTC · via 8.8.8.8
!Passed with warnings
26 passed 2 warnings 0 failed 3 info

Registration

info

.com generic · CSC Corporate Domains, Inc. · expires 2028-07-21

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
CSC Corporate Domains, Inc.
Registered
22 July 1997
Last changed
17 July 2026
Expires
21 July 2028
Status
client transfer prohibited, server delete prohibited, server transfer prohibited, server update prohibited
Registry nameservers
a1-70.akam.net, a10-66.akam.net, a13-66.akam.net, a14-64.akam.net, a18-66.akam.net, a3-66.akam.net, dns1.mayo.edu, dns2.mayo.edu
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 2028-07-21 #3
    The registration is valid until 2028-07-21 (637 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

a1-70.akam.net, a10-66.akam.net, a13-66.akam.net, a14-64.akam.net, a18-66.akam.net, a3-66.akam.net, dns1.mayo.edu, dns2.mayo.edu

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
a1-70.akam.net, a10-66.akam.net, a13-66.akam.net, a14-64.akam.net, a18-66.akam.net, a3-66.akam.net, dns1.mayo.edu, dns2.mayo.edu
NS in the zone
a1-70.akam.net, a10-66.akam.net, a13-66.akam.net, a14-64.akam.net, a18-66.akam.net, a3-66.akam.net, dns1.mayo.edu, dns2.mayo.edu
NameserverAddressesNetwork (AS)Glue
a1-70.akam.net193.108.91.70 2600:1401:2::46AS20940 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-
a13-66.akam.net2.22.230.66 2600:1480:800::42AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a14-64.akam.net184.26.161.64 2600:1480:1800::40AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a18-66.akam.net95.101.36.66 2600:1480:4800::42AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a3-66.akam.net96.7.49.66 2600:1408:1c::42AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
dns1.mayo.edu129.176.18.23AS7973 MAYO - Mayo Foundation for Medical Education and Research, US-
dns2.mayo.edu129.176.3.167AS7973 MAYO - Mayo Foundation for Medical Education and Research, US-

Checks

  • ✓ 8 nameservers #6
    Delegated to a1-70.akam.net, a10-66.akam.net, a13-66.akam.net, a14-64.akam.net, a18-66.akam.net, a3-66.akam.net, dns1.mayo.edu, dns2.mayo.edu.
  • ✓ 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 8 IPv4 /24s and 6 IPv6 /48s.
  • ✓ 3 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; AS7973 (MAYO - Mayo Foundation for Medical Education and Research, US): 2 addresses.
  • ✓ Nameserver names under 2 TLDs #12
    Nameserver names use the TLDs .edu, .net.
  • i
    Partly IPv6
    These nameservers have no IPv6 address: dns1.mayo.edu, dns2.mayo.edu.
    #13

Nameservers

warn

14 of 14 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
a1-70.akam.net 193.108.91.70NOERROR, 4 ms, authoritativenoyes / yesrefused41824.6
a1-70.akam.net 2600:1401:2::46NOERROR, 5 ms, authoritativenoyes / yesrefused41824.5
a10-66.akam.net 96.7.50.66NOERROR, 3 ms, authoritativenoyes / yesrefused48878.30
a10-66.akam.net 2600:1480:d000::42NOERROR, 4 ms, authoritativenoyes / yesrefused48878.33
a13-66.akam.net 2.22.230.66NOERROR, 5 ms, authoritativenoyes / yesrefused41824.9
a13-66.akam.net 2600:1480:800::42NOERROR, 4 ms, authoritativenoyes / yesrefused41824.9
a14-64.akam.net 184.26.161.64NOERROR, 6 ms, authoritativenoyes / yesrefused48878.30
a14-64.akam.net 2600:1480:1800::40NOERROR, 5 ms, authoritativenoyes / yesrefused48878.30
a18-66.akam.net 95.101.36.66NOERROR, 5 ms, authoritativenoyes / yesrefused48878.27
a18-66.akam.net 2600:1480:4800::42NOERROR, 4 ms, authoritativenoyes / yesrefused48878.33
a3-66.akam.net 96.7.49.66NOERROR, 4 ms, authoritativenoyes / yesrefused41824.5
a3-66.akam.net 2600:1408:1c::42NOERROR, 4 ms, authoritativenoyes / yesrefused41824.4
dns1.mayo.edu 129.176.18.23NOERROR, 289 ms, authoritativenoyes / yesrefused-
dns2.mayo.edu 129.176.3.167NOERROR, 124 ms, authoritativenoyes / yesrefused-

Checks

  • ✓ All respond #14
    All 14 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: a1-70.akam.net: "41824.6"; a1-70.akam.net: "41824.5"; a10-66.akam.net: "48878.30"; a10-66.akam.net: "48878.33"; a13-66.akam.net: "41824.9"; a14-64.akam.net: "48878.30"; a18-66.akam.net: "48878.27"; a18-66.akam.net: "48878.33"; a3-66.akam.net: "41824.5"; a3-66.akam.net: "41824.4". 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 591 · primary dns1.mayo.edu

Found

Primary (MNAME)
dns1.mayo.edu
Contact (RNAME)
noc.mayo.edu
Serial
591
Refresh / retry
10800 s / 3600 s
Expire
2592000 s
Negative TTL
900 s

Serial per nameserver

NameserverSerial
a1-70.akam.net (193.108.91.70)591
a1-70.akam.net (2600:1401:2::46)591
a10-66.akam.net (96.7.50.66)591
a10-66.akam.net (2600:1480:d000::42)591
a13-66.akam.net (2.22.230.66)591
a13-66.akam.net (2600:1480:800::42)591
a14-64.akam.net (184.26.161.64)591
a14-64.akam.net (2600:1480:1800::40)591
a18-66.akam.net (95.101.36.66)591
a18-66.akam.net (2600:1480:4800::42)591
a3-66.akam.net (96.7.49.66)591
a3-66.akam.net (2600:1408:1c::42)591
dns1.mayo.edu (129.176.18.23)591
dns2.mayo.edu (129.176.3.167)591

Checks

  • ✓ Serial 591 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 3h, retry 1h, expire 30d, negative TTL 15m.
  • ✓ Primary is a public nameserver #24
    The primary nameserver dns1.mayo.edu is one of the listed nameservers.
  • ✓ Contact noc@mayo.edu #25
    The SOA RNAME noc.mayo.edu means noc@mayo.edu.
  • ✓ Counter serial #26
    The serial 591 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

info

21 records at the apex

Found

Read from
193.108.91.70:53
TypeValueTTL
SOAdns1.mayo.edu. noc.mayo.edu. 591 10800 3600 2592000 900300
NSa14-64.akam.net.300
NSa13-66.akam.net.300
NSdns1.mayo.edu.300
NSa18-66.akam.net.300
NSdns2.mayo.edu.300
NSa1-70.akam.net.300
NSa3-66.akam.net.300
NSa10-66.akam.net.300
A129.176.1.88900
MX20 mail9.mayo.edu.86400
MX20 mail8.mayo.edu.86400
MX20 mail7.mayo.edu.86400
TXT"_uz5g1k3wp3my53wj46cfl46g6oxkp54"300
TXT"google-site-verification=Y4YQPOeQ7IvHdDP0Yn7uqgrCxFWUTG4W2ixor7BrxZ8"300
TXT"google-site-verification=Ke1F9FxDHjGwSRBikOSa1LEfrKoohWn80AMB1a0iHD8"300
TXT"facebook-domain-verification=gnqlpuc6t32rfgtlpsmu7mcz0e30d6"300
TXT"google-site-verification=0o8iuRq3C2ji2-i8ajTpcBd1PZyOYjgyFRwCejdj39o"300
TXT"adobe-idp-site-verification=1a1d294e03dc1f18f089fdab21096893adea673f8881987239a14971cf7c89b5"300
TXT"google-site-verification=6Mm6uKAIYzio5exaZKwyNljPHu1FwB6eU4I-hSnMr3g"300
TXT"ncy863bz54x4hbfx0kxpzms73067ls2p"300

Checks

  • ✓ TTLs within range #32
    TTLs: A 15m, MX 1d, NS 5m. The NS TTL at the parent is 2d and in the zone 5m; 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