ASN Lookup
Look up Autonomous System Number (ASN) information including network prefixes, peering details, and organization data.
ASN Information Lookup
Enter an ASN number (e.g., AS15169 or 15169) or IP address to get detailed information
Understanding ASN Information
Learn about Autonomous System Numbers, network routing, peering relationships, and how to interpret ASN data effectively.
What is an ASN?
Understanding Autonomous System Numbers and their role in internet routing
Autonomous System Number Purpose
An Autonomous System Number (ASN) is a unique identifier assigned to a network or group of networks that are under the control of a single organization and have a unified routing policy.
- • Identifies networks in BGP routing
- • Enables inter-domain routing decisions
- • Provides network ownership information
- • Facilitates peering agreements
- • Helps with network troubleshooting
ASN Types and Ranges
Public ASNs
- • 16-bit: 1-64511
- • 32-bit: 131072-4199999999
- • Used for internet routing
- • Globally unique
Private ASNs
- • 16-bit: 64512-65534
- • 32-bit: 4200000000-4294967294
- • Internal use only
- • Not advertised globally
Key ASN Information Fields
Organization Name
The entity that owns and operates the network
Network Prefixes
IP address ranges announced by this ASN
Peering Information
Details about network interconnections and policies