AS27421 ASPA Check - Applause

Published

APPLAUSEMA - Applause🇺🇸 - ASPA check for AS27421: the upstream transit providers AS27421 has authorized in its RPKI Autonomous System Provider Authorization (ASPA) object, and the networks that list AS27421 as their provider. Routers that validate ASPA use these records to detect route leaks in BGP paths.

ASPA Status
Published
Upstream Providers
4
Downstream Customers
1

How to read this ASPA check

The 4 providers below are the only networks allowed to appear directly above AS27421 in an AS-path. If AS27421 uses a transit provider that is missing from this list, routers that enforce ASPA treat its routes through that provider as invalid, so the list should include every current and backup transit provider. Peers do not belong in it.

Step-by-step ASPA check guide - including how to validate an AS-path hop by hop.

Peering Topology

AS27421 peering topology: 4 upstream providers and 1 downstream customerUpstreams: AS7015, AS7922, AS46887, AS397794. Downstreams: AS397794.AS27421 - APPLAUSEMA - ApplauseAS27421APPLAUSEMA - ApplauseAS7015COMCAST-7015 - Comcas…AS7015 - COMCAST-7015 - Comcast Cable Communications, LLCAS7922COMCAST-7922 - Comcas…AS7922 - COMCAST-7922 - Comcast Cable Communications, LLCAS46887CROWNCASTLE-AS46887 -…AS46887 - CROWNCASTLE-AS46887 - Crown Castle Fiber LLCAS397794APPLAUSE-MARLBORO - A…AS397794 - APPLAUSE-MARLBORO - ApplauseAS397794APPLAUSE-MARLBORO - A…AS397794 - APPLAUSE-MARLBORO - ApplauseUPSTREAMSDOWNSTREAMS

Upstream Providers(4)

AS27421 authorizes these ASNs as upstream transit providers.

ASNName
AS7015🇺🇸COMCAST-7015 - Comcast Cable Communications, LLC
AS7922🇺🇸COMCAST-7922 - Comcast Cable Communications, LLC
AS46887🇺🇸CROWNCASTLE-AS46887 - Crown Castle Fiber LLC
AS397794🇺🇸APPLAUSE-MARLBORO - Applause

Downstream Customers(1)

These ASNs list AS27421 as an authorized upstream provider.

ASNName
AS397794🇺🇸APPLAUSE-MARLBORO - Applause

ASPA object expires: 2026-10-27

Related Tools and Guides

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