IP Address: 148.163.129.52 ⚠ 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
Region:: California
Coordinates:: 34.0544, -118.244

WHOIS Information

Network Name:: PROOFPOINT-NET-NORTH-AMERICA
CIDR:: 148.163.128.0/19
Owner:: Proofpoint, Inc.
Org ID:: PROOF
Address:: 925 W Maude Ave, Sunnyvale, CA 94085
Reverse DNS:: dispatch1-us1.ppe-hosted.com
Last updated: 2/5/2026

Analysis

This IP was first observed on June 12, 2025 and most recently on September 26, 2025. It has been associated with 8 failed authentication events affecting 9 messages, representing moderate activity. The IP belongs to PROOFPOINT-NET-NORTH-AMERICA (Proofpoint, Inc.), a network with activity associated with United States. 2 other IPs in the same /24 subnet (148.163.129.*) also appear in this dataset.

Network Topology

Failures Detected from this IP

Showing 1-8 of 8 failures, affecting 9 messages

Date ▼	Messages
9/26/2025	2
9/18/2025	1
8/6/2025	1
7/3/2025	1
7/2/2025	1
6/27/2025	1
6/26/2025	1
6/12/2025	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 148.163.129.0/24 range observed failing DMARC:

148.163.129.48 (8 failures), 148.163.129.49 (5 failures)