IP Address: 205.220.177.38 ⚠ 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-0024cc01.pphosted.com
Last updated: 2/5/2026

Analysis

This IP was first observed on September 13, 2024 and most recently on June 27, 2025. It has been associated with 5 failed authentication events affecting 5 messages, representing low but recurring activity. The IP belongs to PROOF (Proofpoint, Inc.), a network with activity associated with United States. 2 other IPs in the same /24 subnet (205.220.177.*) also appear in this dataset.

Network Topology

Failures Detected from this IP

Showing 1-5 of 5 failures, affecting 5 messages

Date ▼	Messages
6/27/2025	1
6/4/2025	1
10/23/2024	1
9/27/2024	1
9/13/2024	1

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 205.220.177.0/24 range observed failing DMARC:

205.220.177.118 (1 failure), 205.220.177.206 (1 failure)