`mail.protoexpress.com`

CNAME	`outlook.protoexpress.com`
DNSSEC	⚠️ Not signed
A	207.15.6.51^{🇺🇸 COGENT207.15.6.0/24}
		PTR	`outlook.protoexpress.com`

`protoexpress.com`

	DNSSEC	⚠️ Not signed
	A	207.15.6.10^{🇺🇸 COGENT207.15.6.0/24}
	NS	`auth1.dns.cogentco.com` ⭐
	NS	`auth2.dns.cogentco.com`
	NS	`ns2-auth.sprintlink.net` ⚠️ Not in zone NS records
	MX	`d259874a.ess.barracudanetworks.com` ⭐
	MX	`d259874b.ess.barracudanetworks.com`⁽²⁰⁾
	TXT	`zk/seV8MgAjnxhtZw0C3FFCso0ORfWU/jaD+Hf1qXG9LFzd/k7m0aeQaMF2MJ8/7Qj2tzModm8wfI...`
	TXT	`apple-domain-verification=MAHBhRecqNsmaixR`
	TXT	`knowbe4-site-verification=e405a9a2f744671f662c8133af8db146`
	TXT	`google-gws-recovery-domain-verification=66837767`
	TXT	`v=spf1 ip4:207.15.6.50 ip4:207.15.6.51 include:spf.ess.barracudanetworks.com ...`
	SOA	`auth1.dns.cogentco.com`dns@cogentco.com 2026-01-12 #2

rank #295356 globally
rank #128334 in the tld
📈 Tranco rank: #294,197

PTR for

50.6.15.207.in-addr.arpa

10.6.15.207.in-addr.arpa

Previously MX for

pcbfabexpress.com

protoexpress.com

Same first word

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DNS History

2 records (1 active, 1 former)

○A207.15.6.502015-05-30 → 2016-10-25 · 4 obs

● 2015-05-30 08:17:54
● 2016-10-25 12:53:34
○ 2026-02-20 20:54:30
○ 2026-03-25 18:31:10

●CNAMEoutlook.protoexpress.com2026-02-20 → 2026-03-25 · 2 obs

● 2026-02-20 20:54:30
● 2026-03-25 18:31:10

🔍 DNS Trace

Analysis

IP Addresses

mail.protoexpress.com maps to IP address 207.15.6.51.

Other host names, for example, outlook.protoexpress.com share IP numbers with mail.protoexpress.com.

mail.protoexpress.com - robtex.com