Sh4mefulIP Address: 139.138.59.74 ⚠ Network Confounder
⚠ Network Confounder Detected: Cisco Secure Email/Ironport
Cloud Email Security sometimes breaks SPF and DKIM at the endpoint. Unclear if this is a configuration issue or byproduct the interception of email
Cloud Email Security sometimes breaks SPF and DKIM at the endpoint. Unclear if this is a configuration issue or byproduct the interception of email
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:
- CISL-7
- CIDR:
139.138.56.0/21- Owner:
- Cisco Systems Ironport Division
- Org ID:
CISL-7- Address:
- 170 West Tasman Drive, San Jose, CA 95134
- Reverse DNS:
-
esa1.hc4297-88.iphmx.com
Last updated: 2/5/2026
Analysis
This IP was first observed on September 17, 2024 and most recently on June 26, 2025. It has been associated with 8 failed authentication events affecting 8 messages, representing moderate activity. The IP belongs to CISL-7 (Cisco Systems Ironport Division), a network with activity associated with United States.
External Reputation Lookups
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