IP Address: 185.183.28.105 ⚠ 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:: pfptnl
CIDR:: 185.183.28.0/24
Owner:: Proofpoint
Reverse DNS:: mx08-0018b801.pphosted.com
Last updated: 2/5/2026

Analysis

This IP was first observed on May 31, 2024 and most recently on June 18, 2025. It has been associated with 6 failed authentication events affecting 6 messages, representing moderate activity. The IP belongs to pfptnl (Proofpoint), a network with activity associated with United States. One other IP in the same /24 subnet (185.183.28.*) also appears in this dataset.

Failures Detected from this IP

Showing 1-6 of 6 failures, affecting 6 messages

Date ▼	Messages
6/18/2025	1
9/18/2024	1
9/6/2024	1
8/7/2024	1
6/12/2024	1
5/31/2024	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 185.183.28.0/24 range observed failing DMARC:

185.183.28.103 (13 failures)