IP Address: 205.139.111.43

This page shows DMARC authentication failure data for this IP address. Learn more about this data.

Geolocation Information

Country:: US United States
Coordinates:: 37.751, -97.822

WHOIS Information

Network Name:: CENTURYLINK-LEGACY-SAVVIS-BLK182
CIDR:: 205.138.0.0/15, 205.140.160.0/20, 205.140.128.0/19, 205.140.0.0/17
Owner:: CenturyLink Communications, LLC
Org ID:: CCL-534
Address:: 100 CENTURYLINK DR, Monroe, LA 71201
Reverse DNS:: us-smtp-delivery-43.mimecast.com
Last updated: 2/5/2026

Analysis

This IP was first observed on October 1, 2025 and most recently on February 26, 2026. It has been associated with 7 failed authentication events affecting 7 messages, representing moderate activity. The IP belongs to CENTURYLINK-LEGACY-SAVVIS-BLK182 (CenturyLink Communications, LLC), a commercial ISP with activity associated with United States. 3 other IPs in the same /24 subnet (205.139.111.*) also appear in this dataset.

Network Topology

Failures Detected from this IP

Showing 1-7 of 7 failures, affecting 7 messages

Date ▼	Messages
2/26/2026	1
12/18/2025	1
11/19/2025	1
11/12/2025	1
10/22/2025	1
10/8/2025	1
10/1/2025	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 205.139.111.0/24 range observed failing DMARC:

205.139.111.44 (17 failures), 205.139.111.40 (7 failures), 205.139.111.42 (2 failures)