mdc.firstclassinc.com - robtex.com

mdc.firstclassinc.com

DNSSEC⚠️ Not signed
A75.145.142.228🇺🇸 COMCAST-IBONE75.144.0.0/13 Comcast Cable Communications, Inc. 1800 Bishops Gate Blvd Mt Laurel, NJ 08054
PTR75-145-142-228-illinois.hfc.comcastbusiness.net

firstclassinc.com

DNSSEC⚠️ Not signed
A75.145.142.227🇺🇸 COMCAST-IBONE75.144.0.0/13 Comcast Cable Communications, Inc. 1800 Bishops Gate Blvd Mt Laurel, NJ 08054
NSns55.domaincontrol.com ⭐
NSns56.domaincontrol.com
MXmdc.firstclassinc.com ⭐
TXT_globalsign-domain-verification=rZPditX6BZjOGt31e-QSNTxV8S99YnEyLvbRxXtzUs
TXTv=spf1 ip4:104.182.132.242 ip4:23.125.108.104 ip4:23.125.108.99 mx -all
TXT_globalsign-domain-verification=BoGYPvFHaAUqMkn61MWC015oPpFVbCo4xBjpLB40BN
SOAns55.domaincontrol.comdns@jomax.net 2023-09-26 #0
WOT: SAFE (62/100)
WOT: SAFE (68/100)

MX for

firstclassinc.com

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DNS History

1 record (1 active, 0 former)

A75.145.142.228
●A75.145.142.2282026-02-15 → 2026-05-11 · 2 obs
● 2026-02-15 20:08:56
● 2026-05-11 20:42:28

🔍 DNS Trace

📋 Delegation Chain

ZoneNameserversGlue
coml.gtld-servers.net, j.gtld-servers.net, h.gtld-servers.net, d.gtld-servers.net...-
firstclassinc.comns55.domaincontrol.com, ns56.domaincontrol.com4 records

✅ Authoritative Response

Server:97.74.107.28

NS records: ns55.domaincontrol.com, ns56.domaincontrol.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for firstclassinc.com (unsigned zone)

⏱️ Timing

Total: 99ms | Queries: -

📄 Records

TypeCountSample Data
A175.145.142.228

📌 Glue Records Collected

Total: 4

Out-of-bailiwick: 4 (ns55.domaincontrol.com, ns55.domaincontrol.com, ns56.domaincontrol.com...)

Analysis

Mail Server Role

mdc.firstclassinc.com serves as a mail server for firstclassinc.com.

IP Addresses

mdc.firstclassinc.com resolves to one IP number: 75.145.142.228.

Other host names, for example mail.firstclassinc.com, share IP numbers with mdc.firstclassinc.com.