Autonomous System Number (AS Number) Queries
This page provides detailed information about querying Autonomous System Numbers (ASNs) using the RDAP command line client.
Basic AS Number Queries
Simple AS Number Lookup
Query information about a specific Autonomous System Number:
This command will: - Automatically detect that "as64496" is an AS number - Use the RDAP bootstrap process to find the appropriate Regional Internet Registry (RIR) - Display AS information
Explicit AS Number Type Specification
You can explicitly specify the query type to avoid automatic inference:
AS Number Formats
Standard AS Number Format
The most common format uses the "as" prefix followed by the number:
Numeric-Only Format
You can also query using just the numeric portion:
Server Targeting Options
Bootstrap Registry Selection
Direct queries to a specific RIR using its bootstrap identifier:
# Query ARIN specifically
rdap -b arin as64496
# Query RIPE NCC
rdap -b ripe as65536
# Query APNIC
rdap -b apnic as13335
Common RIR identifiers for AS numbers:
- arin - American Registry for Internet Numbers
- ripe - RIPE Network Coordination Centre
- apnic - Asia-Pacific Network Information Centre
- lacnic - Latin America and Caribbean Network Information Centre
- afrinic - African Network Information Centre
Explicit Server URL
Direct queries to a specific RDAP server:
This bypasses the bootstrap process and sends the query directly to the specified server.
INR Backup Bootstrap
When normal bootstrapping fails for AS numbers, you can specify a backup: