IP Address: 148.163.150.39 ⚠ 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-008e3101.pphosted.com
Last updated: 2/5/2026

Analysis

This IP was first observed on September 20, 2024 and most recently on July 23, 2025. It has been associated with 6 failed authentication events affecting 13 messages, representing moderate activity. The IP belongs to PROOFPOINT-NET-NORTH-AMERICA (Proofpoint, Inc.), a network with activity associated with United States. One other IP in the same /24 subnet (148.163.150.*) also appears in this dataset.

Failures Detected from this IP

Showing 1-6 of 6 failures, affecting 13 messages

Date ▼	Messages
7/23/2025	5
7/17/2025	3
6/27/2025	1
2/14/2025	2
11/20/2024	1
9/20/2024	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 148.163.150.0/24 range observed failing DMARC:

148.163.150.77 (4 failures)