Sh4mefulIP Address: 216.71.138.142 ⚠ 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:
216.71.128.0/19- Owner:
- Cisco Systems Ironport Division
- Org ID:
CISL-7- Address:
- 170 West Tasman Drive, San Jose, CA 95134
- Reverse DNS:
-
esa1.hc4985-57.iphmx.com
Last updated: 2/5/2026
Analysis
This IP was first observed on September 17, 2024 and most recently on May 13, 2025. It has been associated with 9 failed authentication events affecting 13 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
Look up this IP in external threat intelligence and reputation databases (opens in new tab):