interactivebrokers.com

Checked 22 October 2026, 09:21 UTC · via 8.8.8.8
✗Problems found
23 passed 3 warnings 1 failed 4 info

Registration

info

.com generic · Network Solutions, LLC · expires 2032-05-06

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
Network Solutions, LLC
Registered
5 May 1997
Last changed
6 May 2022
Expires
6 May 2032
Status
client transfer prohibited
Registry nameservers
cdns.interactivebrokers.com, ndns.interactivebrokers.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 2032-05-06 #3
    The registration is valid until 2032-05-06 (2022 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

warn

cdns.interactivebrokers.com, ndns.interactivebrokers.com

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
cdns.interactivebrokers.com, ndns.interactivebrokers.com
NS in the zone
cdns.interactivebrokers.com, ndns.interactivebrokers.com
NameserverAddressesNetwork (AS)Glue
cdns.interactivebrokers.com63.86.206.51AS40711 INTERACTIVE-CHIC - Interactive Brokers LLC, US63.86.206.51
ndns.interactivebrokers.com64.190.196.29AS27163 INTERACTIVE-BROKERS-CORP - Interactive Brokers Corp, US64.190.196.29

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: cdns.interactivebrokers.com, ndns.interactivebrokers.com.
    #6
  • ✓ Parent and zone agree #7
    The parent delegation and the zone's NS records list the same nameservers.
  • ✓ Glue present and correct #8
    Glue is published for the nameservers inside the zone: cdns.interactivebrokers.com, ndns.interactivebrokers.com.
  • ✓ 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 2 IPv4 /24s and 0 IPv6 /48s.
  • ✓ 2 autonomous systems #11
    The nameservers are spread over: AS27163 (INTERACTIVE-BROKERS-CORP - Interactive Brokers Corp, US): 1 address; AS40711 (INTERACTIVE-CHIC - Interactive Brokers LLC, US): 1 address.
  • 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
  • !
    No IPv6
    None of the nameservers has an IPv6 address, so IPv6-only resolvers can't reach them.
    #13

Nameservers

fail

2 of 2 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
cdns.interactivebrokers.com 63.86.206.51NOERROR, 118 ms, authoritativenono / yesrefusedNSD 4.3.8
ndns.interactivebrokers.com 64.190.196.29NOERROR, 99 ms, authoritativenono / yesrefusedNSD 4.3.8

Checks

  • ✓ All respond #14
    All 2 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: cdns.interactivebrokers.com: "NSD 4.3.8"; ndns.interactivebrokers.com: "NSD 4.3.8". Hide or replace the version string.
    #17
  • ✓ Zone transfers refused #18
    No nameserver allows a zone transfer to the public.
  • ✗
    No DNS over TCP
    DNS over TCP is required (RFC 7766); without it, large answers such as DNSSEC responses fail. Not answering over TCP: cdns.interactivebrokers.com (63.86.206.51): read tcp 46.225.38.91:58480->63.86.206.51:53: read: connection reset by peer; ndns.interactivebrokers.com (64.190.196.29): dial tcp 64.190.196.29:53: connect: connection refused.
    #19
  • ✓ EDNS supported #20
    All nameservers support EDNS(0).
  • ✓ Public addresses #21
    All nameserver addresses are publicly routable.

SOA

pass

serial 2026100701 · primary ndns.interactivebrokers.com

Found

Primary (MNAME)
ndns.interactivebrokers.com
Contact (RNAME)
admin.interactivebrokers.com
Serial
2026100701
Refresh / retry
43200 s / 3600 s
Expire
2419200 s
Negative TTL
900 s

Serial per nameserver

NameserverSerial
cdns.interactivebrokers.com (63.86.206.51)2026100701
ndns.interactivebrokers.com (64.190.196.29)2026100701

Checks

  • ✓ Serial 2026100701 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 12h, retry 1h, expire 28d, negative TTL 15m.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ndns.interactivebrokers.com is one of the listed nameservers.
  • ✓ Contact admin@interactivebrokers.com #25
    The SOA RNAME admin.interactivebrokers.com means admin@interactivebrokers.com.
  • ✓ Date-based serial #26
    The serial 2026100701 follows the YYYYMMDDnn convention (2026-10-07).

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

18 records at the apex

Found

Read from
63.86.206.51:53
TypeValueTTL
SOAndns.interactivebrokers.com. admin.interactivebrokers.com. 2026100701 43200 3600 2419200 900900
NScdns.interactivebrokers.com.900
NSndns.interactivebrokers.com.900
A64.190.196.59900
A63.86.206.59900
MX10 mxb-001fa301.gslb.pphosted.com.3600
MX10 mxa-001fa301.gslb.pphosted.com.3600
TXT"domain-verification=75ca5a994c230b3fccbfe5096e6cc5c1ba84ff9b104f88f02f96653205745378"900
TXT"v=spf1 ip4:64.190.196.83 ip4:64.190.196.84 ip4:67.231.158.158 ip4:67.231.151.29 ip4:67.231.152.177 ip4:208.84.65.220 include:spf-001fa301.pphosted.com include:spfext.ibkr.com include:spf.protection.outlook.com include:everbridge.net -all"900
TXT"facebook-domain-verification=ctgtxqblyzevdy546ugunfrycq8qju"900
TXT"jamf-site-verification=LThgnhi5sQG8Hun0_u4WxQ"900
TXT"omnissa-connect-verification-c4bcd08d-d3d8-4bf7-a8eb-ca864cf60122"900
TXT"teamviewer-sso-verification=6d22443f674144d3a8ef63c4231aa10e"900
TXT"box-domain-verification=f3c37ed4f239c2fa789ed783539ec8e014770a8d0ffc2d521f442bae6c981d51"900
TXT"8983ae8c-359e-43f4-a5e9-58fb8219fbb0"900
TXT"cd81f94bedb743838df0ba92afde02d7"900
TXT"openai-domain-verification=dv-WpyC1rkamNnDMgsC0FTTKGei"900
TXT"anthropic-domain-verification-3rc7bd=a5yvy3X01lHko3VtUaMxcVi62"900

Checks

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