IP Address: 148.163.154.29 ⚠ 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:: mx0b-0077b904.pphosted.com
Last updated: 2/5/2026

Analysis

This IP was first observed on April 15, 2025 and most recently on July 8, 2025. It has been associated with 5 failed authentication events affecting 10 messages, representing low but recurring 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 (148.163.154.*) also appear in this dataset.

Network Topology

Failures Detected from this IP

Showing 1-5 of 5 failures, affecting 10 messages

Date ▼	Messages
7/8/2025	3
6/30/2025	4
6/24/2025	1
6/11/2025	1
4/15/2025	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 148.163.154.0/24 range observed failing DMARC:

148.163.154.228 (4 failures), 148.163.154.171 (1 failure)