IP Address: 66.77.129.73

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-QWEST-INET-12
CIDR:: 66.77.0.0/16
Owner:: CenturyLink Communications, LLC
Org ID:: CCL-534
Address:: 100 CENTURYLINK DR, Monroe, LA 71201
Reverse DNS:: smtp03.kforce.com
Last updated: 2/5/2026

Analysis

This IP was first observed on September 13, 2024 and most recently on June 27, 2025. It has been associated with 6 failed authentication events affecting 9 messages, representing moderate activity. The IP belongs to CENTURYLINK-LEGACY-QWEST-INET-12 (CenturyLink Communications, LLC), a commercial ISP with activity associated with United States. 2 other IPs in the same /24 subnet (66.77.129.*) also appear in this dataset.

Network Topology

Failures Detected from this IP

Showing 1-6 of 6 failures, affecting 9 messages

Date ▼	Messages
6/27/2025	1
11/20/2024	2
11/12/2024	1
9/27/2024	1
9/18/2024	1
9/13/2024	3

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 66.77.129.0/24 range observed failing DMARC:

66.77.129.72 (4 failures), 66.77.129.71 (3 failures)