`mx0b-00a0a501.pphosted.com`

DNSSEC	⚠️ Not signed
A	205.220.173.114^{🇺🇸 Proofpoint205.220.173.0/24 Inc.}
		PTR	`mx0b-00a0a501.pphosted.com`

`pphosted.com`

	DNSSEC	⚠️ Not signed
	NS	`ns1.proofpoint.com` ⭐
	NS	`ns3.proofpoint.com`
	NS	`pdns99.ultradns.biz`
	NS	`pdns99.ultradns.com`
	NS	`pdns99.ultradns.net`
	NS	`pdns99.ultradns.org`
	MX	`mx1.proofpoint.com.gslb.pphosted.com` ⭐
	MX	`mx2.proofpoint.com.gslb.pphosted.com`⁽¹⁵⁾
	TXT	`google-site-verification=xgpnp2Tk7Uy09Lh_SCs288UD6MGNmwQrkxCHbf_wA4s`
	TXT	`google-site-verification=vRcwt0BAkjp1OlMn5RlWNZvtXuodpx0yVivAsdS9tIg`
	TXT	`google-site-verification=hQmZ4SoVHu3-87ttDtWWAVwOwlq44SPe67ZUxBKbGQY`
	TXT	`z1tp46gvrqvdkptyggtf30ch0rsvn7zh`
	TXT	`v=spf1 include:%{ir}.%{v}.%{d}.spf.has.pphosted.com ip4:208.84.66.28 mx a:sup...`
	SOA	`ns1.proofpoint.com`ops@proofpoint.com serial=2026384376

WOT: SAFE (50/100)
📈 Tranco rank: #2,866

Proofpoint Email Hosting Infrastructure

pphosted.com is Proofpoint's dedicated email hosting infrastructure domain, used to deliver cloud-based email security services to enterprise customers. Proofpoint is a major cybersecurity company protecting over 80 Fortune 100 companies against email-based threats.

Purpose

The domain serves as the backbone for Proofpoint's hosted email gateway services:

Mail Routing — Customer MX records point to subdomains likemx0b-004f2901.pphosted.com, routing email through Proofpoint's filtering infrastructure
SPF Authentication — Provides SPF include mechanisms (spf.has.pphosted.com) for customer email authentication
GSLB Load Balancing — Uses global server load balancing (GSLB) subdomains for high-availability mail delivery

The domain hosts tens of thousands of customer-specific subdomains for mail routing and security filtering.

DNS Infrastructure

Nameservers: Dual-provider setup using Proofpoint's own nameservers (ns1.proofpoint.com,ns3.proofpoint.com) alongside UltraDNS (pdns99.ultradns.com/net/org/biz) for redundancy
Mail Servers:mx1.proofpoint.com.gslb.pphosted.com(priority 10) andmx2.proofpoint.com.gslb.pphosted.com(priority 15)
IPv4: 67.231.144.185, 67.231.152.185
IPv6: 2620:100:9001:b9::1, 2620:100:9005:b9::1
DNSSEC: Not enabled

About Proofpoint

Proofpoint provides email security, threat protection, and compliance solutions. Their platform analyzes over 3.4 trillion emails annually, using AI and machine learning to detect phishing, business email compromise (BEC), ransomware, and malware. The company was acquired by Thoma Bravo in 2021 for $12.3 billion.

PTR for

114.173.220.205.in-addr.arpa

MX for

amex.tech

DNS History

1 record (1 active, 0 former)

●A205.220.173.1142026-03-26 → 2026-03-27 · 2 obs

● 2026-03-26 07:09:16
● 2026-03-27 15:10:40

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
pphosted.com	ns1.proofpoint.com, ns3.proofpoint.com, pdns99.ultradns.net, pdns99.ultradns.com...	-

✅ Authoritative Response

Server:208.84.67.208

NS records: ns1.proofpoint.com, ns3.proofpoint.com, pdns99.ultradns.net, pdns99.ultradns.com, pdns99.ultradns.biz, pdns99.ultradns.org

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for pphosted.com (unsigned zone)

⏱️ Timing

Total: 166ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`205.220.173.114`

Analysis

Mail Server Role

The mail server for amex.tech is mx0b-00a0a501.pphosted.com.

For mail handling, mx0a-00a0a501.pphosted.com serves as a mail server together with mx0b-00a0a501.pphosted.com.

IP Addresses

mx0b-00a0a501.pphosted.com points to a single IP number: 205.220.173.114.

mx0b-00a0a501.pphosted.com - robtex.com