loopnet.com

Checked 22 October 2026, 09:40 UTC · via 8.8.8.8
!Passed with warnings
24 passed 4 warnings 0 failed 3 info

Registration

info

.com generic · MarkMonitor Inc. · expires 2034-07-28

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
MarkMonitor Inc.
Registered
29 July 1995
Last changed
15 July 2025
Expires
28 July 2034
Status
client delete prohibited, client transfer prohibited, client update prohibited, server delete prohibited, server transfer prohibited, server update prohibited
Registry nameservers
a1-73.akam.net, a22-64.akam.net, a3-65.akam.net, a4-66.akam.net, a6-67.akam.net, a9-64.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 2034-07-28 #3
    The registration is valid until 2034-07-28 (2835 days).
  • ✓ Transfer locked #4
    Registry status: client delete prohibited, client transfer prohibited, client update 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

a1-73.akam.net, a22-64.akam.net, a3-65.akam.net, a4-66.akam.net, a6-67.akam.net, a9-64.akam.net

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
a1-73.akam.net, a22-64.akam.net, a3-65.akam.net, a4-66.akam.net, a6-67.akam.net, a9-64.akam.net
NS in the zone
a1-73.akam.net, a22-64.akam.net, a3-65.akam.net, a4-66.akam.net, a6-67.akam.net, a9-64.akam.net
NameserverAddressesNetwork (AS)Glue
a1-73.akam.net193.108.91.73 2600:1401:2::49AS20940 AKAMAI-ASN1 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a22-64.akam.net23.211.61.64 2600:1480:7800::40AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a3-65.akam.net96.7.49.65 2600:1408:1c::41AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a4-66.akam.net72.246.46.66 2600:1480:9000::42AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a6-67.akam.net23.211.133.67 2600:1401:1::43AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a9-64.akam.net184.85.248.64 2a02:26f0:117::40AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-

Checks

  • ✓ 6 nameservers #6
    Delegated to a1-73.akam.net, a22-64.akam.net, a3-65.akam.net, a4-66.akam.net, a6-67.akam.net, a9-64.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
a1-73.akam.net 193.108.91.73NOERROR, 6 ms, authoritativenoyes / yesrefused41824.5
a1-73.akam.net 2600:1401:2::49NOERROR, 7 ms, authoritativenoyes / yesrefused41824.7
a22-64.akam.net 23.211.61.64NOERROR, 5 ms, authoritativenoyes / yesrefused48878.29
a22-64.akam.net 2600:1480:7800::40NOERROR, 5 ms, authoritativenoyes / yesrefused48878.29
a3-65.akam.net 96.7.49.65NOERROR, 4 ms, authoritativenoyes / yesrefused41824.6
a3-65.akam.net 2600:1408:1c::41NOERROR, 7 ms, authoritativenoyes / yesrefused41824.11
a4-66.akam.net 72.246.46.66NOERROR, 8 ms, authoritativenoyes / yesrefused48878.32
a4-66.akam.net 2600:1480:9000::42NOERROR, 8 ms, authoritativenoyes / yesrefused48878.33
a6-67.akam.net 23.211.133.67NOERROR, 3 ms, authoritativenoyes / yesrefused48878.33
a6-67.akam.net 2600:1401:1::43NOERROR, 4 ms, authoritativenoyes / yesrefused48878.29
a9-64.akam.net 184.85.248.64NOERROR, 9 ms, authoritativenoyes / yesrefused41824.11
a9-64.akam.net 2a02:26f0:117::40NOERROR, 9 ms, authoritativenoyes / yesrefused41824.9

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: a1-73.akam.net: "41824.5"; a1-73.akam.net: "41824.7"; a22-64.akam.net: "48878.29"; a3-65.akam.net: "41824.6"; a3-65.akam.net: "41824.11"; a4-66.akam.net: "48878.32"; a4-66.akam.net: "48878.33"; a6-67.akam.net: "48878.33"; a6-67.akam.net: "48878.29"; a9-64.akam.net: "41824.11"; a9-64.akam.net: "41824.9". 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 2026092901 · primary ns1.costar.com

Found

Primary (MNAME)
ns1.costar.com
Contact (RNAME)
hostmaster.costar.com
Serial
2026092901
Refresh / retry
10800 s / 3600 s
Expire
604800 s
Negative TTL
60 s

Serial per nameserver

NameserverSerial
a1-73.akam.net (193.108.91.73)2026092901
a1-73.akam.net (2600:1401:2::49)2026092901
a22-64.akam.net (23.211.61.64)2026092901
a22-64.akam.net (2600:1480:7800::40)2026092901
a3-65.akam.net (96.7.49.65)2026092901
a3-65.akam.net (2600:1408:1c::41)2026092901
a4-66.akam.net (72.246.46.66)2026092901
a4-66.akam.net (2600:1480:9000::42)2026092901
a6-67.akam.net (23.211.133.67)2026092901
a6-67.akam.net (2600:1401:1::43)2026092901
a9-64.akam.net (184.85.248.64)2026092901
a9-64.akam.net (2a02:26f0:117::40)2026092901

Checks

  • ✓ Serial 2026092901 everywhere #22
    All nameservers serve the same version of the zone.
  • !
    Unusual SOA timers
    negative caching TTL (minimum) 1m is outside 5m–1d (RFC 2308 recommends 1–3 hours). Current values: refresh 3h, retry 1h, expire 7d, negative TTL 1m.
    #23
  • i
    Hidden master
    The primary nameserver ns1.costar.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@costar.com #25
    The SOA RNAME hostmaster.costar.com means hostmaster@costar.com.
  • ✓ Date-based serial #26
    The serial 2026092901 follows the YYYYMMDDnn convention (2026-09-29).

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

48 records at the apex

Found

Read from
193.108.91.73:53
TypeValueTTL
SOAns1.costar.com. hostmaster.costar.com. 2026092901 10800 3600 604800 60600
NSa9-64.akam.net.600
NSa6-67.akam.net.600
NSa4-66.akam.net.600
NSa3-65.akam.net.600
NSa1-73.akam.net.600
NSa22-64.akam.net.600
A104.101.253.17520
AAAA2a02:26f0:b700:380::29f720
AAAA2a02:26f0:b700:395::29f720
MX10 loopnet-com.mail.protection.outlook.com.300
TXT"segment-site-verification=ZKtvP2EirqqnADSurcFBIBP1UhH5TKak"600
TXT"_2j4f57rzo6nut1kznqclkbmwmiyhqw2"600
TXT"_tdkq9tvjbh9k2bl3z6dydxibfcvk0nh"600
TXT"adobe-idp-site-verification=24664704b6bf9cad007ee8e4e6f54db759418404868491369b399f373520defd"600
TXT"google-site-verification=IiZj4QH3zGAoUp1JS2Y2rCbPsA7Zt8K1FVmW24AuDMI"600
TXT"docker-verification=fe5a3e19-1a55-4f9d-aaa4-ae1f0b91b56a"600
TXT"780t66jsf2qt277tm40hhrr4mf"600
TXT"logmein-verification-code=5f312521-40b7-4efa-864d-daa11426c61d"600
TXT"facebook-domain-verification=ai2bi2l0g12u65182rlv8j0yb84dk1"600
TXT"cut8t3r196sjr7fgsk307ra8o8"600
TXT"figma-domain-verification=8232118525ac89d71aa3f807657ba9e5e26cfa8f711f2e3144c4c5c7fc2aec1e-1734372308"600
TXT"ZOOM_verify_wHw4ZtE0T1mMVPgwuSHBTQ"600
TXT"google-site-verification=1TNuV8IIrto6s8u_EbOFhIMGzxDzOJjU1hpzNFPyhNM"600
TXT"pardot667613=e62c1cbd7b786f718b06fa3d807213aff5698269e76d782cf12b579f8ffe7482"600
TXT"l3e27huqj099s10rvob7pcp0ta"600
TXT"_t6qvb6w9p2g2xjf35n9qo2jikqxa44w"600
TXT"pardot667613=dc6abf7ce1ec5674ad80006a093fb42009188f1af7d39583883145fd0020e5ef"600
TXT"qIoo2EAbiBfr8TxXrEMBE0G0bqnFiCYrffv2w49v2CzKEPzByOzoDWnS7LzweT4EJQLE8JvixUgcnMSbh5SmKA=="600
TXT"_gqd2lyb6thtgv25zkb0easa7uvs80ag"600
TXT"MS=907928941E4C46CFFBDBCDAAC04B2974DB66DF61"600
TXT"abl0ulnlu4dinpicl2ar22ivpf"600
TXT"google-site-verification=AVV7t2lExwlFGSwrr2K-hPxAq6aViq8cKB6CQQMQDdQ"600
TXT"google-site-verification=XlGNtGSzRdkr8RR8U2trI04JOKjFvYyUYo3omLtvLC0"600
TXT"stripe-verification=1bf83902d0e23af2db44060889e1e9f83b81e1a1cc533d1c026798ea7552ee70"600
TXT"hodd31f155oqgiru8gikg8jl11"600
TXT"google-site-verification=0lgHNiXCP3yud301Lnx0GcMfJJbQl1PdtbL1j70H7lA"600
TXT"_ajhl9ne8crpkbk8oxu816wwbal9ajyn"600
TXT"atlassian-domain-verification=LAkz2FUxxMo9oBp9qlpKyMPkFQT3p7fXn2F/dz0S07Gt8LASUog19dNicOe7njFJ"600
TXT"MS=ms30108235"600
TXT"pardot923983=7d8e1dc8378884ee5a0b8ad3f827d9883fb4bfc1a1b2ea8abd9799e50347218a"600
TXT"segment-site-verification=EJ5XBlMRO6eNK6LEQ2G4hSLzNudjOGiN"600
TXT"v=spf1 ip4:65.222.180.0/24 ip4:65.222.181.0/24 ip4:65.210.23.128/25 include:costar.com include:sendgrid.net ~all"600
TXT"google-site-verification=u3QtaNKri6oImAUqNvLmX9sznXql21FSMVllaDIy-_s"600
CAA0 issue "letsencrypt.org"3600
CAA0 issue "godaddy.com"3600
CAA0 issue "amazon.com"3600
CAA0 issue "digicert.com"3600

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 10m; 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: letsencrypt.org, godaddy.com, amazon.com, digicert.com.