asn.dev

Observed topology

AS19855 MASERGY

Unclassified ARIN

Upstreams 8 carry this network
Downstreams 16 this network carries
Adjacent (IPv4) 24
Adjacent (IPv6) 8
Upstream graph Who carries AS19855, and who carries them, drawn as a map up to the transit-free core. 0 exchanges Where AS19855 physically turns up to peer, and its address on each fabric.

Transit

Upstream networks

inferred

Networks observed carrying traffic for AS19855: 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
AS3356Level 3 Parent, LLCTransitIPv4 IPv63,609
AS7922Comcast Cable Communications, LLCResidentialIPv4 IPv6853
AS3491PCCW Global (HK) Ltd.TransitIPv4 IPv6588
AS7473Singapore Telecommunications LtdUnclassifiedIPv4 IPv6331
AS12956TELEFONICA GLOBAL SOLUTIONS SLTransitIPv4 IPv6231
AS7474SingTel Optus Pty LtdUnclassifiedIPv4 IPv6185
AS33491Comcast Cable Communications, LLCUnclassifiedIPv4180
AS174Cogent Communications, LLCTransitIPv4 IPv655

Transit

Downstream networks

All 16

Networks for which AS19855 was observed as the last hop before the origin, meaning it appears to provide them transit.

ASNetworkTypeFamiliesPaths seen
AS40399Masergy Cloud Communications, Inc.UnclassifiedIPv4418
AS12222Akamai Technologies, Inc.HostingIPv4 IPv6232
AS26428The Talbots, Inc.UnclassifiedIPv4185
AS15027Foley Hoag LLPUnclassifiedIPv4120
AS14514Paul, Hastings, Janofsky & Walker LLPUnclassifiedIPv460
AS15126Suzuki Marine USA, LLCUnclassifiedIPv460
AS394301Dexcom, INC.UnclassifiedIPv460
AS20340CallTower, Inc.HostingIPv459
AS33014MARLIN LEASING CORPORATIONUnclassifiedIPv456
AS13860Lincoln National CorporationUnclassifiedIPv436

All 16 downstreams →

Adjacency

Adjacent networks

All 24

Every AS seen directly next to AS19855 in a routing path, in either direction.

ASNetworkTypeFamiliesPaths seen
AS3356Level 3 Parent, LLCTransitIPv4 IPv64,369
AS7922Comcast Cable Communications, LLCResidentialIPv4 IPv61,085
AS3491PCCW Global (HK) Ltd.TransitIPv4 IPv6723
AS7473Singapore Telecommunications LtdUnclassifiedIPv4 IPv6488
AS40399Masergy Cloud Communications, Inc.UnclassifiedIPv4418
AS7474SingTel Optus Pty LtdUnclassifiedIPv4 IPv6259
AS12222Akamai Technologies, Inc.HostingIPv4 IPv6232
AS12956TELEFONICA GLOBAL SOLUTIONS SLTransitIPv4 IPv6231
AS26428The Talbots, Inc.UnclassifiedIPv4185
AS33491Comcast Cable Communications, LLCUnclassifiedIPv4180

All 24 adjacent →

Provenance

Where this comes from

Derived from routing tables collected at 2026-10-16 10:00 UTC by route-views2,rrc00, as seen from 75 BGP vantage points across 73.23M 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.