mail.polytechnet.com - dns.ninja

`mail.polytechnet.com`

DNSSEC	⚠️ Not signed
A	72.138.155.84^{🇨🇦 ROGERS-CABLE-AS72.138.0.0/16}
		PTR	`mail.polytechnet.com`

`polytechnet.com`

	DNSSEC	⚠️ Not signed
	A	184.106.55.34^{🇺🇸 LiquidWeb184.106.55.0/24 Network Block}
	NS	`ns1.swbell.net` ⭐
	NS	`cbru.br.ns.els-gms.att.net` ⚠️ Not in parent delegation
	NS	`cmtu.mt.ns.els-gms.att.net` ⚠️ Not in parent delegation
	NS	`ns2.swbell.net`
	MX	`mail.polytechnet.com` ⭐
	TXT	`v=spf1 mx ip4:72.138.155.84 ip4:72.138.155.85 -all`
	SOA	`ns1.swbell.net`rm-hostmaster@ems.att.com serial=10

PTR for

84.155.138.72.in-addr.arpa

MX for

polytechnet.com

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DNS History

3 records (1 active, 2 former)

○A67.37.70.182007-11-24 → 2007-11-24 · 3 obs

● 2007-11-24 20:33:54
○ 2015-06-25 07:49:04
○ 2026-06-28 17:17:46

○A67.37.70.252015-06-25 → 2016-04-20 · 5 obs

○ 2007-11-24 20:33:54
● 2015-06-25 07:49:04
● 2016-04-20 05:21:46
○ 2026-03-27 07:20:02
○ 2026-06-28 17:17:46

●A72.138.155.842026-03-27 → 2026-06-28 · 3 obs

○ 2016-04-20 05:21:46
● 2026-03-27 07:20:02
● 2026-06-28 17:17:46

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	a.gtld-servers.net, e.gtld-servers.net, d.gtld-servers.net, m.gtld-servers.net...	-
polytechnet.com	ns1.swbell.net, ns2.swbell.net	-

✅ Authoritative Response

Server:151.164.11.218

NS records: ns1.swbell.net, ns2.swbell.net

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for polytechnet.com (unsigned zone)

⏱️ Timing

Total: 235ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`72.138.155.84`

Analysis

Mail Server Role

The mail server mail.polytechnet.com processes email for polytechnet.com.

IP Addresses

mail.polytechnet.com resolves to just one IP address, 72.138.155.84.