asn.dev

Observed topology

AS17645 NTT-SG-AP ASN - NTT SINGAPORE PTE LTD

Unclassified APNIC

Upstreams 5 carry this network
Downstreams 9 this network carries
Adjacent (IPv4) 14
Adjacent (IPv6) 4
Upstream graph Who carries AS17645, and who carries them, drawn as a map up to the transit-free core. 1 exchange Where AS17645 physically turns up to peer, and its address on each fabric.

Transit

Upstream networks

inferred

Networks observed carrying traffic for AS17645: the AS immediately before it in a routing path. Ranked by how many paths showed the relationship, which reflects how widely it is used, not how much traffic crosses it.

ASNetworkTypeFamiliesPaths seen
AS2914NTT America, Inc.TransitIPv4 IPv6349
AS3491PCCW Global (HK) Ltd.TransitIPv4 IPv6280
AS4637Telstra GlobalUnclassifiedIPv4 IPv686
AS4657StarHub LtdResidentialIPv424
AS38566NTTCTNETUnclassifiedIPv44

Transit

Downstream networks

inferred

Networks for which AS17645 was observed as the last hop before the origin, meaning it appears to provide them transit.

ASNetworkTypeFamiliesPaths seen
AS10204Arcnet NTT MSC ISPUnclassifiedIPv4 IPv6286
AS56227Zurich Financial Services Australia LimitedUnclassifiedIPv4236
AS139896Kim Chuan Telecommunications ComplexUnclassifiedIPv470
AS38566NTTCTNETUnclassifiedIPv465
AS10236AXA Technology Services Asia (HK) LimitedUnclassifiedIPv459
AS45794NTT Singapore - IP Network (RFC 2270)UnclassifiedIPv459
AS46078Dimension Data AP Kaki Bukit SingaporeUnclassifiedIPv459
AS131789Asahi Kasei International IT Asia Pacific Co., LTDUnclassifiedIPv428
AS132018NATIXISUnclassifiedIPv410

Adjacency

Adjacent networks

All 14

Every AS seen directly next to AS17645 in a routing path, in either direction.

ASNetworkTypeFamiliesPaths seen
AS2914NTT America, Inc.TransitIPv4 IPv61,042
AS3491PCCW Global (HK) Ltd.TransitIPv4 IPv6870
AS4657StarHub LtdResidentialIPv4670
AS10204Arcnet NTT MSC ISPUnclassifiedIPv4 IPv6304
AS4637Telstra GlobalUnclassifiedIPv4 IPv6247
AS56227Zurich Financial Services Australia LimitedUnclassifiedIPv4236
AS38566NTTCTNETUnclassifiedIPv475
AS139896Kim Chuan Telecommunications ComplexUnclassifiedIPv470
AS10236AXA Technology Services Asia (HK) LimitedUnclassifiedIPv459
AS45794NTT Singapore - IP Network (RFC 2270)UnclassifiedIPv459

All 14 adjacent →

Provenance

Where this comes from

Derived from routing tables collected at 2026-10-19 10:00 UTC by route-views2,rrc00, as seen from 75 BGP vantage points across 73.17M route entries. These are observations from those vantage points, not a complete or authoritative view of the internet.

Inferred from path position, not from any declaration by either party. A network appearing here is carrying these routes; whether that is a paid transit arrangement, a backup, or something else is not something routing data can tell you. Adjacency is not the same as peering. Being next to each other in a path covers paid transit, settlement-free peering and customer connections alike, and routing data cannot distinguish them. Treat this as "these networks exchange routes", nothing more specific.

Cross-check against RIPEstat or BGP.tools, which observe from a different and larger set of vantage points.