psu.com

Checked 22 October 2026, 10:22 UTC · via 8.8.8.8
!Passed with warnings
23 passed 2 warnings 0 failed 6 info

Registration

info

.com generic · GoDaddy Online Services Cayman Islands Ltd. · expires 2027-03-03

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
GoDaddy Online Services Cayman Islands Ltd.
Registered
3 March 2000
Last changed
28 January 2023
Expires
3 March 2027
Status
client delete prohibited, client renew prohibited, client transfer prohibited, client update prohibited
Registry nameservers
fred.ns.cloudflare.com, nina.ns.cloudflare.com
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 2027-03-03 #3
    The registration is valid until 2027-03-03 (132 days).
  • ✓ Transfer locked #4
    Registry status: client delete prohibited, client renew 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

fred.ns.cloudflare.com, nina.ns.cloudflare.com

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
fred.ns.cloudflare.com, nina.ns.cloudflare.com
NS in the zone
fred.ns.cloudflare.com, nina.ns.cloudflare.com
NameserverAddressesNetwork (AS)Glue
fred.ns.cloudflare.com172.64.33.113 173.245.59.113 108.162.193.113 2803:f800:50::6ca2:c171 2606:4700:58::adf5:3b71 2a06:98c1:50::ac40:2171AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US108.162.193.113 172.64.33.113 173.245.59.113 2606:4700:58::adf5:3b71 2803:f800:50::6ca2:c171 2a06:98c1:50::ac40:2171
nina.ns.cloudflare.com173.245.58.136 108.162.192.136 172.64.32.136 2803:f800:50::6ca2:c088 2606:4700:50::adf5:3a88 2a06:98c1:50::ac40:2088AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US108.162.192.136 172.64.32.136 173.245.58.136 2606:4700:50::adf5:3a88 2803:f800:50::6ca2:c088 2a06:98c1:50::ac40:2088

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: fred.ns.cloudflare.com, nina.ns.cloudflare.com.
    #6
  • ✓ 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 4 IPv6 /48s.
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS13335 (CLOUDFLARENET - Cloudflare, Inc., US): 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 .com
    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
fred.ns.cloudflare.com 172.64.33.113NOERROR, 5 ms, authoritativenoyes / yesrefused2026.10.2
fred.ns.cloudflare.com 173.245.59.113NOERROR, 5 ms, authoritativenoyes / yesrefused2026.10.2
fred.ns.cloudflare.com 108.162.193.113NOERROR, 5 ms, authoritativenoyes / yesrefused2026.10.2
fred.ns.cloudflare.com 2803:f800:50::6ca2:c171NOERROR, 6 ms, authoritativenoyes / yesrefused2026.10.2
fred.ns.cloudflare.com 2606:4700:58::adf5:3b71NOERROR, 6 ms, authoritativenoyes / yesrefused2026.10.2
fred.ns.cloudflare.com 2a06:98c1:50::ac40:2171NOERROR, 9 ms, authoritativenoyes / yesrefused2026.10.2
nina.ns.cloudflare.com 173.245.58.136NOERROR, 6 ms, authoritativenoyes / yesrefused2026.10.2
nina.ns.cloudflare.com 108.162.192.136NOERROR, 6 ms, authoritativenoyes / yesrefused2026.10.2
nina.ns.cloudflare.com 172.64.32.136NOERROR, 6 ms, authoritativenoyes / yesrefused2026.10.2
nina.ns.cloudflare.com 2803:f800:50::6ca2:c088NOERROR, 6 ms, authoritativenoyes / yesrefused2026.10.2
nina.ns.cloudflare.com 2606:4700:50::adf5:3a88NOERROR, 11 ms, authoritativenoyes / yesrefused2026.10.2
nina.ns.cloudflare.com 2a06:98c1:50::ac40:2088NOERROR, 5 ms, authoritativenoyes / yesrefused2026.10.2

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: fred.ns.cloudflare.com: "2026.10.2"; nina.ns.cloudflare.com: "2026.10.2". 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 2416418822 · primary fred.ns.cloudflare.com

Found

Primary (MNAME)
fred.ns.cloudflare.com
Contact (RNAME)
dns.cloudflare.com
Serial
2416418822
Refresh / retry
10000 s / 2400 s
Expire
604800 s
Negative TTL
1800 s

Serial per nameserver

NameserverSerial
fred.ns.cloudflare.com (172.64.33.113)2416418822
fred.ns.cloudflare.com (173.245.59.113)2416418822
fred.ns.cloudflare.com (108.162.193.113)2416418822
fred.ns.cloudflare.com (2803:f800:50::6ca2:c171)2416418822
fred.ns.cloudflare.com (2606:4700:58::adf5:3b71)2416418822
fred.ns.cloudflare.com (2a06:98c1:50::ac40:2171)2416418822
nina.ns.cloudflare.com (173.245.58.136)2416418822
nina.ns.cloudflare.com (108.162.192.136)2416418822
nina.ns.cloudflare.com (172.64.32.136)2416418822
nina.ns.cloudflare.com (2803:f800:50::6ca2:c088)2416418822
nina.ns.cloudflare.com (2606:4700:50::adf5:3a88)2416418822
nina.ns.cloudflare.com (2a06:98c1:50::ac40:2088)2416418822

Checks

  • ✓ Serial 2416418822 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 2h46m40s, retry 40m, expire 7d, negative TTL 30m.
  • ✓ Primary is a public nameserver #24
    The primary nameserver fred.ns.cloudflare.com is one of the listed nameservers.
  • ✓ Contact dns@cloudflare.com #25
    The SOA RNAME dns.cloudflare.com means dns@cloudflare.com.
  • ✓ Timestamp serial #26
    The serial 2416418822 is a Unix timestamp (2046-07-28 19:27 UTC).

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

8 records at the apex

Found

Read from
172.64.33.113:53
TypeValueTTL
SOAfred.ns.cloudflare.com. dns.cloudflare.com. 2416418822 10000 2400 604800 18001800
NSfred.ns.cloudflare.com.86400
NSnina.ns.cloudflare.com.86400
A188.114.97.3300
A188.114.96.3300
MX0 _dc-mx.d02c22f5676a.psu.com.300
TXT"google-site-verification=rZcqSVmLZ4dKgHMl3638i_Mr5eqF6yy7y9-ukb9m_W8"300
TXT"v=spf1 +ip4:75.98.175.80 +include:spf.a2hosting.com +include:_spf.google.com +include:mailgun.org ~all"300

Checks

  • ✓ TTLs within range #32
    TTLs: A 5m, MX 5m, 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.
  • i
    Wildcard record
    A random name under the zone resolves, so there is a wildcard (*) record. Typos and non-existent hosts resolve too, which can confuse mail and certificate checks.
    #34
  • 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