IP Address: 148.163.153.251 ⚠ 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-008e3101.pphosted.com
Last updated: 2/5/2026

Analysis

This IP was first observed on October 23, 2024 and most recently on July 17, 2025. It has been associated with 11 failed authentication events affecting 22 messages, representing moderate activity. The IP belongs to PROOFPOINT-NET-NORTH-AMERICA (Proofpoint, Inc.), a network with activity associated with United States. 3 other IPs in the same /24 subnet (148.163.153.*) also appear in this dataset.

Network Topology

Failures Detected from this IP

Showing 1-11 of 11 failures, affecting 22 messages

Date ▼	Messages
7/17/2025	2
7/11/2025	5
6/27/2025	3
3/12/2025	1
2/28/2025	1
12/18/2024	2
12/17/2024	1
12/4/2024	4
11/20/2024	1
11/8/2024	1
10/23/2024	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 148.163.153.0/24 range observed failing DMARC:

148.163.153.103 (2 failures), 148.163.153.119 (1 failure), 148.163.153.66 (1 failure)