imbc.com

Checked 22 October 2026, 09:15 UTC · via 8.8.8.8
✗Problems found
21 passed 2 warnings 1 failed 7 info

Registration

info

.com generic · Netpia.com, Inc. · expires 2027-01-07

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
Netpia.com, Inc.
Registered
8 January 1997
Last changed
8 January 2026
Expires
7 January 2027
Status
active
Registry nameservers
ns.imbc.com, ns2.imbc.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 2027-01-07 #3
    The registration is valid until 2027-01-07 (76 days).
  • i
    No transfer lock
    The domain has no transfer lock (status: active). A registrar lock protects against unauthorized transfers.
    #4
  • ✓ Registry and delegation match #5
    The nameservers registered at the registry are the ones published in DNS.

Delegation

warn

ns.imbc.com, ns2.imbc.com

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
ns.imbc.com, ns2.imbc.com
NS in the zone
ns.imbc.com, ns2.imbc.com
NameserverAddressesNetwork (AS)Glue
ns.imbc.com121.254.134.99AS3786 LGDACOM-KR - LG DACOM Corporation, KR121.254.134.99
ns2.imbc.com121.254.133.100AS3786 LGDACOM-KR - LG DACOM Corporation, KR121.254.133.100

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: ns.imbc.com, ns2.imbc.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: ns.imbc.com, ns2.imbc.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.
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS3786 (LGDACOM-KR - LG DACOM Corporation, KR): 2 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
  • !
    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
ns.imbc.com 121.254.134.99NOERROR, 220 ms, authoritativeOPENyes / yesrefusedBIND VERSION
ns2.imbc.com 121.254.133.100NOERROR, 218 ms, authoritativeOPENyes / yesrefusedBIND VERSION

Checks

  • ✓ All respond #14
    All 2 nameserver addresses answered.
  • ✓ All authoritative #15
    Every responding nameserver answers authoritatively for the zone.
  • ✗
    Open recursion
    These nameservers resolve names for anyone, which makes them usable for DNS amplification attacks and cache poisoning: ns.imbc.com (121.254.134.99), ns2.imbc.com (121.254.133.100). Disable recursion on authoritative servers.
    #16
  • i
    Identifying string disclosed
    These nameservers answer version queries with a string that is not a version number: ns.imbc.com: "BIND VERSION"; ns2.imbc.com: "BIND VERSION".
    #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 2026102203 · primary ns.imbc.com

Found

Primary (MNAME)
ns.imbc.com
Contact (RNAME)
root.ns.imbc.com
Serial
2026102203
Refresh / retry
1800 s / 300 s
Expire
604800 s
Negative TTL
300 s

Serial per nameserver

NameserverSerial
ns.imbc.com (121.254.134.99)2026102203
ns2.imbc.com (121.254.133.100)2026102203

Checks

  • ✓ Serial 2026102203 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 30m, retry 5m, expire 7d, negative TTL 5m.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns.imbc.com is one of the listed nameservers.
  • ✓ Contact root@ns.imbc.com #25
    The SOA RNAME root.ns.imbc.com means root@ns.imbc.com.
  • ✓ Date-based serial #26
    The serial 2026102203 follows the YYYYMMDDnn convention (2026-10-22).

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

9 records at the apex

Found

Read from
121.254.134.99:53
TypeValueTTL
SOAns.imbc.com. root.ns.imbc.com. 2026102203 1800 300 604800 300600
NSns2.imbc.com.600
NSns.imbc.com.600
A121.254.134.116600
MX0 kr1-aspmx1.worksmobile.com.300
MX10 kr1-aspmx2.worksmobile.com.300
TXT"_kuyj7k2yqfvg3bdrtjbrcxaqb5q8fhu"120
TXT"_jxsdvbfy27i3yzxpgc6dih7x4p0ervp"120
TXT"v=spf1 ip4:211.171.60.110 ip4:121.254.133.141 ip4:121.254.133.142 ip4:121.254.133.131 ip4:121.254.133.143 ip4:121.254.133.144 ip4:121.254.134.149 ip4:121.254.134.25 -all"120

Checks

  • ✓ TTLs within range #32
    TTLs: A 10m, MX 5m, NS 10m. The NS TTL at the parent is 2d and in the zone 10m; 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