IP Address: 148.163.156.45 ⚠ 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:: mx0a-001b8001.pphosted.com
Last updated: 2/5/2026

Analysis

This IP was first observed on September 13, 2024 and most recently on December 4, 2024. It has been associated with 3 failed authentication events affecting 4 messages, representing low but recurring activity. The IP belongs to PROOFPOINT-NET-NORTH-AMERICA (Proofpoint, Inc.), a network with activity associated with United States. 4 other IPs in the same /24 subnet (148.163.156.*) also appear in this dataset.

Network Topology

Failures Detected from this IP

Showing 1-3 of 3 failures, affecting 4 messages

Date ▼	Messages
12/4/2024	2
10/23/2024	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 148.163.156.0/24 range observed failing DMARC:

148.163.156.7 (3 failures), 148.163.156.171 (2 failures), 148.163.156.36 (2 failures), 148.163.156.169 (1 failure)