AS209505 ASPA Check - UNCHAINEDISP Unchained ISP Limited

Published

UNCHAINEDISP Unchained ISP Limited🇬🇧 - ASPA check for AS209505: the upstream transit providers AS209505 has authorized in its RPKI Autonomous System Provider Authorization (ASPA) object, and the networks that list AS209505 as their provider. Routers that validate ASPA use these records to detect route leaks in BGP paths.

ASPA Status

Published

Upstream Providers

Downstream Customers

How to read this ASPA check

The 4 providers below are the only networks allowed to appear directly above AS209505 in an AS-path. If AS209505 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

Upstream Providers(4)

AS209505 authorizes these ASNs as upstream transit providers.

ASN	Name
AS1299	🇸🇪TWELVE99 Arelion Sweden AB
AS2914	🇺🇸NTT-DATA-2914 - NTT America, Inc.
AS6762	🇮🇹SEABONE-NET TELECOM ITALIA SPARKLE S.p.A.
AS35200	🇬🇧TransitX-Ltd TransitX Ltd

Downstream Customers(3)

These ASNs list AS209505 as an authorized upstream provider.

ASN	Name
AS42330	🇬🇧UNCHAINEDISP Unchained ISP Limited
AS201115	🇬🇧PYLONONE Pylon One Ltd
AS219369	🇬🇧C2T ConstructInTech Limited

ASPA object expires: 2026-10-27

Related Tools and Guides

How to run an ASPA check - read and verify an ASPA record step by step
ASPA explained - how provider authorization stops route leaks
ASPA Check tool - check the ASPA record of any other ASN
RPKI & ROA Lookup - validate prefixes and check ASPA records for any ASN
Global ASPA Adoption Statistics - transit-free ASNs, top upstream providers, adoption trends
AS209505 Overview - prefixes, BGP routes, peers, and RPKI status

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