All networks that AS21263 declares as a provider with ASPA:
| ASN | Description | |
|---|---|---|
| AS3257 | GTT Communications Inc. | |
| AS3320 | Deutsche Telekom AG | |
| AS3356 | Lumen (Level 3) | |
| AS6762 | Telecom Italia Sparkle (Seabone) | |
| AS6939 | Hurricane Electric LLC | |
| AS200020 | Stichting NBIP-NaWas |
All networks that class AS21263 as a provider with ASPA:
AS21263 has no current ASPA authorised downstreams