Upstream networks
AS19739 COUNTY-SANBERNARDINO - County of San Bernardino
Unclassified ARIN
Transit
Upstream networks
Networks observed carrying traffic for AS19739: 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.
| AS | Network | Type | Families | Paths seen |
|---|---|---|---|---|
| AS3356 | Level 3 Parent, LLC | Transit | IPv4 | 1,106 |
| AS5650 | Frontier Communications of America, Inc. | Residential | IPv4 | 330 |
| AS20001 | Charter Communications Inc | Residential | IPv4 | 178 |
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.
Derived from routing tables collected at 2026-11-14 10:00 UTC by route-views2,rrc00, as seen from 75 BGP vantage points across 74.46M route entries. These are observations from those vantage points, not a complete or authoritative view of the internet.