IP Address: 205.220.173.90 ⚠ Network Confounder

⚠ Network Confounder Detected: Proofpoint Email Security
Proofpoint network identifier

This page shows DMARC authentication failure data for this IP address. Learn more about this data.

Geolocation Information

Country:: US United States
Coordinates:: 37.751, -97.822

WHOIS Information

Network Name:: PROOF
CIDR:: 205.220.160.0/19
Owner:: Proofpoint, Inc.
Org ID:: PROOF
Address:: 925 W Maude Ave, Sunnyvale, CA 94085
Reverse DNS:: mx0b-004f0d02.pphosted.com
Last updated: 2/5/2026

Analysis

This IP was observed on a single date: September 27, 2024. It has been associated with 1 failed authentication event affecting 2 messages — a single isolated event. The IP belongs to PROOF (Proofpoint, Inc.), a network with activity associated with United States. One other IP in the same /24 subnet (205.220.173.*) also appears in this dataset.

Failures Detected from this IP

Showing 1-1 of 1 failures, affecting 2 messages

Date ▼	Messages
9/27/2024	2

External Reputation Lookups

Look up this IP in external threat intelligence and reputation databases (opens in new tab):

AbuseIPDB Cisco Talos Project Honey Pot GreyNoise VirusTotal Shodan Censys Spamhaus

Nearby IPs

Other IPs in the 205.220.173.0/24 range observed failing DMARC:

205.220.173.248 (8 failures)