mhmedical.com

Checked 22 October 2026, 09:50 UTC · via 8.8.8.8
!Passed with warnings
26 passed 1 warning 0 failed 4 info

Registration

info

.com generic · CSC Corporate Domains, Inc. · expires 2026-12-06

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
CSC Corporate Domains, Inc.
Registered
6 December 2011
Last changed
2 December 2025
Expires
6 December 2026
Status
client transfer prohibited
Registry nameservers
pdns85.ultradns.biz, pdns85.ultradns.com, pdns85.ultradns.net, pdns85.ultradns.org
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 2026-12-06 #3
    The registration is valid until 2026-12-06 (45 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

pdns85.ultradns.biz, pdns85.ultradns.com, pdns85.ultradns.net, pdns85.ultradns.org

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
pdns85.ultradns.biz, pdns85.ultradns.com, pdns85.ultradns.net, pdns85.ultradns.org
NS in the zone
pdns85.ultradns.biz, pdns85.ultradns.com, pdns85.ultradns.net, pdns85.ultradns.org
NameserverAddressesNetwork (AS)Glue
pdns85.ultradns.biz156.154.66.85 2610:a1:1015::79AS12008 VERCARA - Vercara, LLC, US AS12008 VERCARA - Vercara, LLC, US-
pdns85.ultradns.com156.154.64.85 2001:502:f3ff::79AS12008 VERCARA - Vercara, LLC, US AS12008 VERCARA - Vercara, LLC, US156.154.64.85 2001:502:f3ff::79
pdns85.ultradns.net156.154.65.85 2610:a1:1014::79AS12008 VERCARA - Vercara, LLC, US AS12008 VERCARA - Vercara, LLC, US-
pdns85.ultradns.org156.154.67.85 2001:502:4612::79AS12008 VERCARA - Vercara, LLC, US AS12008 VERCARA - Vercara, LLC, US-

Checks

  • ✓ 4 nameservers #6
    Delegated to pdns85.ultradns.biz, pdns85.ultradns.com, pdns85.ultradns.net, pdns85.ultradns.org.
  • ✓ 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 (AS12008 (VERCARA - Vercara, LLC, 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 .biz, .com, .net, .org.
  • ✓ All reachable over IPv6 #13
    Every nameserver has an IPv6 address.

Nameservers

info

8 of 8 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
pdns85.ultradns.biz 156.154.66.85NOERROR, 3 ms, authoritativenoyes / yesrefusedUltraDNS Nameserver
pdns85.ultradns.biz 2610:a1:1015::79NOERROR, 3 ms, authoritativenoyes / yesrefusedUltraDNS Nameserver
pdns85.ultradns.com 156.154.64.85NOERROR, 3 ms, authoritativenoyes / yesrefusedUltraDNS Nameserver
pdns85.ultradns.com 2001:502:f3ff::79NOERROR, 3 ms, authoritativenoyes / yesrefusedUltraDNS Nameserver
pdns85.ultradns.net 156.154.65.85NOERROR, 3 ms, authoritativenoyes / yesrefusedUltraDNS Nameserver
pdns85.ultradns.net 2610:a1:1014::79NOERROR, 3 ms, authoritativenoyes / yesrefusedUltraDNS Nameserver
pdns85.ultradns.org 156.154.67.85NOERROR, 31 ms, authoritativenoyes / yesrefusedUltraDNS Nameserver
pdns85.ultradns.org 2001:502:4612::79NOERROR, 31 ms, authoritativenoyes / yesrefusedUltraDNS Nameserver

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.
  • i
    Identifying string disclosed
    These nameservers answer version queries with a string that is not a version number: pdns85.ultradns.biz: "UltraDNS Nameserver"; pdns85.ultradns.com: "UltraDNS Nameserver"; pdns85.ultradns.net: "UltraDNS Nameserver"; pdns85.ultradns.org: "UltraDNS Nameserver".
    #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 2014120736 · primary pdns85.ultradns.com

Found

Primary (MNAME)
pdns85.ultradns.com
Contact (RNAME)
hostmaster.mheducation.com
Serial
2014120736
Refresh / retry
14400 s / 7200 s
Expire
2592000 s
Negative TTL
300 s

Serial per nameserver

NameserverSerial
pdns85.ultradns.biz (156.154.66.85)2014120736
pdns85.ultradns.biz (2610:a1:1015::79)2014120736
pdns85.ultradns.com (156.154.64.85)2014120736
pdns85.ultradns.com (2001:502:f3ff::79)2014120736
pdns85.ultradns.net (156.154.65.85)2014120736
pdns85.ultradns.net (2610:a1:1014::79)2014120736
pdns85.ultradns.org (156.154.67.85)2014120736
pdns85.ultradns.org (2001:502:4612::79)2014120736

Checks

  • ✓ Serial 2014120736 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 4h, retry 2h, expire 30d, negative TTL 5m.
  • ✓ Primary is a public nameserver #24
    The primary nameserver pdns85.ultradns.com is one of the listed nameservers.
  • ✓ Contact hostmaster@mheducation.com #25
    The SOA RNAME hostmaster.mheducation.com means hostmaster@mheducation.com.
  • ✓ Date-based serial #26
    The serial 2014120736 follows the YYYYMMDDnn convention (2014-12-07).

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

7 records at the apex

Found

Read from
156.154.66.85:53
TypeValueTTL
SOApdns85.ultradns.com. hostmaster.mheducation.com. 2014120736 14400 7200 2592000 300600
NSpdns85.ultradns.biz.86400
NSpdns85.ultradns.com.86400
NSpdns85.ultradns.net.86400
NSpdns85.ultradns.org.86400
A52.152.192.18600
TXT"v=spf1 mx -all"1800

Checks

  • ✓ TTLs within range #32
    TTLs: A 10m, NS 1d. The NS TTL at the parent is 2d and in the zone 1d; 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