BGP ASN Reference
Look up BGP Autonomous System Number ranges and reserved blocks.
| Range | Type | Description |
|---|---|---|
| 0 | Reserved | Reserved |
| 1 β 23455 | Public | Public AS numbers |
| 23456 | Reserved | AS_TRANS (BGP federation) |
| 23457 β 64495 | Public | Public AS numbers |
| 64496 β 64511 | Documentation | Reserved for documentation |
| 64512 β 65534 | Private | Private use (16-bit) |
| 65535 | Reserved | Reserved |
| 65536 β 65551 | Documentation | Reserved for documentation (32-bit) |
| 65552 β 131071 | Reserved | Reserved |
| 131072 β 4199999999 | Public | Public 32-bit AS numbers |
| 4200000000 β 4294967294 | Private | Private 32-bit AS numbers |
| 4294967295 | Reserved | Reserved |
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About this tool
Look up BGP Autonomous System Number ranges and reserved blocks.