Observed topology
AS16246 AS16246 NEJ.cz s.r.o
Unclassified APNIC Cable/DSL/ISP
Transit
Upstream networks
Networks observed carrying traffic for AS16246: 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 |
|---|---|---|---|---|
| AS5610 | O2 Czech Republic, a.s. | Unclassified | IPv4 IPv6 | 831 |
Transit
Downstream networks
Networks for which AS16246 was observed as the last hop before the origin, meaning it appears to provide them transit.
| AS | Network | Type | Families | Paths seen |
|---|---|---|---|---|
| AS12570 | O2 Czech Republic, a.s. | Unclassified | IPv4 IPv6 | 712 |
| AS41046 | O2 Czech Republic, a.s. | Unclassified | IPv4 IPv6 | 538 |
| AS62178 | MASTER IT Technologies, a.s. | Unclassified | IPv4 IPv6 | 457 |
| AS31246 | O2 Czech Republic, a.s. | Unclassified | IPv4 IPv6 | 360 |
| AS29321 | O2 Czech Republic, a.s. | Unclassified | IPv4 IPv6 | 322 |
| AS212315 | Frantisek Toman | Unclassified | IPv4 IPv6 | 207 |
| AS44070 | O2 Czech Republic, a.s. | Unclassified | IPv4 IPv6 | 151 |
| AS49767 | O2 Czech Republic, a.s. | Unclassified | IPv4 IPv6 | 150 |
| AS197197 | CETIN a.s. | Unclassified | IPv4 IPv6 | 92 |
| AS202657 | Pavel Jochim | Unclassified | IPv4 IPv6 | 91 |
Adjacency
Adjacent networks
Every AS seen directly next to AS16246 in a routing path, in either direction.
| AS | Network | Type | Families | Paths seen |
|---|---|---|---|---|
| AS5610 | O2 Czech Republic, a.s. | Unclassified | IPv4 IPv6 | 5,090 |
| AS12570 | O2 Czech Republic, a.s. | Unclassified | IPv4 IPv6 | 1,726 |
| AS41046 | O2 Czech Republic, a.s. | Unclassified | IPv4 IPv6 | 538 |
| AS62178 | MASTER IT Technologies, a.s. | Unclassified | IPv4 IPv6 | 482 |
| AS31246 | O2 Czech Republic, a.s. | Unclassified | IPv4 IPv6 | 360 |
| AS29321 | O2 Czech Republic, a.s. | Unclassified | IPv4 IPv6 | 322 |
| AS212315 | Frantisek Toman | Unclassified | IPv4 IPv6 | 207 |
| AS44070 | O2 Czech Republic, a.s. | Unclassified | IPv4 IPv6 | 151 |
| AS49767 | O2 Czech Republic, a.s. | Unclassified | IPv4 IPv6 | 150 |
| AS197197 | CETIN a.s. | Unclassified | IPv4 IPv6 | 92 |
Provenance
Where this comes from
Derived from routing tables collected at 2026-10-26 10:00 UTC by route-views2,rrc00, as seen from 75 BGP vantage points across 73.14M 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.