investors.com

Checked 22 October 2026, 09:21 UTC · via 8.8.8.8
!Passed with warnings
21 passed 4 warnings 0 failed 6 info

Registration

info

.com generic · MarkMonitor Inc. · expires 2027-08-18

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
MarkMonitor Inc.
Registered
19 August 1994
Last changed
17 July 2026
Expires
18 August 2027
Status
client delete prohibited, client transfer prohibited, client update prohibited
Registry nameservers
cf1.investors.com, cf2.investors.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 2027-08-18 #3
    The registration is valid until 2027-08-18 (299 days).
  • ✓ Transfer locked #4
    Registry status: client delete 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

warn

cf1.investors.com, cf2.investors.com

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
cf1.investors.com, cf2.investors.com
NS in the zone
cf1.investors.com, cf2.investors.com
NameserverAddressesNetwork (AS)Glue
cf1.investors.com162.159.0.39 2400:cb00:2049:1::a29f:27AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US162.159.0.39
cf2.investors.com162.159.1.39 2400:cb00:2049:1::a29f:127AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US162.159.1.39

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: cf1.investors.com, cf2.investors.com.
    #6
  • ✓ Parent and zone agree #7
    The parent delegation and the zone's NS records list the same nameservers.
  • !
    Glue differs from the zone
    The addresses at the parent (glue) differ from the addresses in the zone: cf1.investors.com (glue 162.159.0.39, zone 162.159.0.39, 2400:cb00:2049:1::a29f:27); cf2.investors.com (glue 162.159.1.39, zone 162.159.1.39, 2400:cb00:2049:1::a29f:127). Update the glue at your registrar.
    #8
  • ✓ All names resolve #9
    Every nameserver name has an address and is not an alias.
  • i
    One address family in one network
    all IPv6 addresses are in 2400:cb00:2049::/48, while the other address family is spread over several networks.
    #10
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS13335 (CLOUDFLARENET - Cloudflare, Inc., US): 4 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

4 of 4 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
cf1.investors.com 162.159.0.39NOERROR, 14 ms, authoritativenoyes / yesrefused2026.10.2
cf1.investors.com 2400:cb00:2049:1::a29f:27NOERROR, 15 ms, authoritativenoyes / yesrefused2026.10.2
cf2.investors.com 162.159.1.39NOERROR, 14 ms, authoritativenoyes / yesrefused2026.10.2
cf2.investors.com 2400:cb00:2049:1::a29f:127NOERROR, 15 ms, authoritativenoyes / yesrefused2026.10.2

Checks

  • ✓ All respond #14
    All 4 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: cf1.investors.com: "2026.10.2"; cf2.investors.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 2417060501 · primary cf1.investors.com

Found

Primary (MNAME)
cf1.investors.com
Contact (RNAME)
dns.cloudflare.com
Serial
2417060501
Refresh / retry
10000 s / 2400 s
Expire
604800 s
Negative TTL
1800 s

Serial per nameserver

NameserverSerial
cf1.investors.com (162.159.0.39)2417060501
cf1.investors.com (2400:cb00:2049:1::a29f:27)2417060501
cf2.investors.com (162.159.1.39)2417060501
cf2.investors.com (2400:cb00:2049:1::a29f:127)2417060501

Checks

  • ✓ Serial 2417060501 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 cf1.investors.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 2417060501 is a Unix timestamp (2046-08-05 05:41 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

warn

28 records at the apex

Found

Read from
162.159.0.39:53
TypeValueTTL
SOAcf1.investors.com. dns.cloudflare.com. 2417060501 10000 2400 604800 18001800
NScf1.investors.com.86400
NScf2.investors.com.86400
A104.18.159.173300
A104.16.64.225300
MX10 mxa-00596a01.gslb.pphosted.com.60
MX10 mxb-00596a01.gslb.pphosted.com.60
TXT"MS=ms28139923"60
TXT"MS=ms85269853"60
TXT"RpMGMohYOGAnggUYRwJBiwv9E/Z5cMYr1SX5y8OgBNLKINQNc8NfyRQjc+f2IArlp8LfbCFxPTjc7Elrw9lPQQ=="60
TXT"ValidationTokenValue=fc1d628b-9e4c-4c0d-a8e1-81ca2c984ffe"60
TXT"adobe-idp-site-verification=7e37d0dd9c3a6ee8cb6c31be11d23c8e9ad271796a35ca19d312705778c47181"60
TXT"amazonses:yBtaTfwvyJxsKj4qzx1xabokNoqPuRiTljh/eZPXxNQ="60
TXT"apple-domain-verification=DQzn157yeqG2cWua"60
TXT"atlassian-domain-verification=uNoIhBXurxzVlQa0FvK2t9Yld5byfvXbFRQaMToGvrieKjBdylMs8jcSXRKQKqao"60
TXT"ciscocidomainverification=7368568cf6d67b71bea590c354c5dd9c0deffad365be29e4a57b38fc9993ac3a"60
TXT"datadome-domain-verify=mBXJ0OcsBIxmEYtkepO9rBwdPNmfTk5Q"60
TXT"docker-verification=45a98df1-0c84-4c8c-b9d0-389df44ecc31"60
TXT"facebook-domain-verification=gmebzbbwiekifhhmyguudnuyil5ord"60
TXT"figma-domain-verification=b411f1d2852c2c7e057a2d6d70fb22896f37ccc1412d1e1bb4f9da14e2b78ad9-1769000244"60
TXT"google-site-verification=83Fn7kcr0hJaD5w_euvXsPTDzK5J4zsMbpleJ89YfGY"60
TXT"google-site-verification=BF9Mw6pM6X-KswuzU1XxIq67G4pt2PYF1klltXXi0Ts"60
TXT"google-site-verification=jCCv_q2xEMwfgZTI5ioE0A5dpdv-NvT3jVnfCoA4B9Y"60
TXT"knowbe4-site-verification=0694ce74005828dc4bb8b7299bfb6f61"60
TXT"miro-verification=fc4f542b1bf4fc981e2f11e463246349bde0a8d0"60
TXT"v=spf1 include:aspmx.sailthru.com include:spf-00596a01.pphosted.com include:_spf.google.com ip4:63.71.211.0/24 ip4:192.216.65.0/24 ip4:198.200.194.0/24 ip4:63.240.89.0/24 ip4:63.240.103.0/26 ip4:216.136.162.64/26 ip4:216.136.229.0/24 ip4:216.136.168.64/2" "7 ip4:206.17.168.0/25 ip4:64" ".79.35.0/24 ip4:205.203.128.0/24 include:spf-00596a03.pphosted.com include:_spf.salesforce.com include:amazonses.com ~all"60
TXT"wiz-domain-verification=0a9c41b6b137ce002ca72276158d108297343cfef1c1335d77ee2dd88605215a"60
TXT"wiz-domain-verification=3a67a668690a94ded6df7d56d997e8bd72c447d0b0e643d511534fd5bfc15751"60

Checks

  • !
    Very low TTLs
    These records have a TTL below 5m, causing extra queries and slower lookups: MX (1m). Low TTLs are useful just before a planned change. The NS TTL at the parent is 2d and in the zone 1d; 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