AS16246O2 Czech Republic, a.s.
CzechiaRegistryRIPE NCCTypeEyeballAs of 27th September 2026, AS16246 (O2 Czech Republic, a.s.), an access network registered in Czechia with RIPE NCC, originates 13 IPv4 prefixes covering 133k addresses and 2 IPv6 prefixes. By IPv4 address space that makes it the 1,863rd-largest of the 79,525 networks we see originating IPv4, and the 11th-largest of 574 in Czechia. It is seen behind 1 upstream network, most often AS5610 (O2 Czech Republic, a.s.), and in front of 13 downstream networks. Every one of its announcements has a valid RPKI ROA, and none are RPKI-invalid. 100% of its routes reach at least 90% of full-feed peers.
At a glance
IPv4 prefixes
IPv6 prefixes
IPv4 addresses
IPv6 /64s
Upstream graph
The networks AS16246 is seen behind, one and two hops out, drawn from real AS paths.
Networks observed one and two hops upstream of AS16246 in real AS paths. A thicker line means more vantage points saw that adjacency, so weight tracks how well attested it is — not how much traffic it carries. Adjacency is an observation; whether it is a transit purchase or a settlement-free peering is an inference, and is labelled as one wherever we show it.
Neighbouring networks
28
adjacent networks
- Upstreams
- 14%
- Peers
- 1450%
- Downstreams
- 1346%
Networks carrying this one's traffic toward the rest of the internet.
| Network | Country | Relationship | Paths | Vantage pts |
|---|---|---|---|---|
| AS5610O2 Czech Republic, a.s. | CZ | Peer | 6,762 | 144 |
Prefixes
The largest blocks AS16246 originates, widest first.
| Prefix | Addresses | Visibility |
|---|---|---|
| 188.175.0.0/16 | 65.5k | 80/81 |
| 94.74.192.0/18 | 16.4k | 80/81 |
| 82.150.160.0/19 | 8.2k | 80/81 |
| 86.63.192.0/19 | 8.2k | 80/81 |
| 92.240.160.0/19 | 8.2k | 80/81 |
| 213.180.32.0/19 | 8.2k | 80/81 |
| 95.143.128.0/20 | 4.1k | 80/81 |
| 176.98.96.0/20 | 4.1k | 80/81 |
| 178.17.96.0/20 | 4.1k | 80/81 |
| 77.87.232.0/21 | 2k | 80/81 |
Routing health
How AS16246's own announcements validate against RPKI and how far they propagate. The same measures for the whole routing table are on the routing table in numbers.
RPKI origin validation
- Valid100.0%15
- Invalid0.0%0
- No ROA0.0%0
Propagation
- Globally propagated90% of full-feed peers or more100.0%15
- Partially propagated40% to 90%0.0%0
- Seen by few peersUnder 40%0.0%0
Prefix sizes
IPv4 — 13 prefixes
IPv6 — 2 prefixes
- /2934.4B × /6450.0%1
- /324.3B × /6450.0%1
Recent changes
Announcements that started or stopped since 28th Aug 2026.
No announcement by AS16246 started or stopped in this period.
Routing data derived from RouteViews MRT archives, BGPKIT relationship inference and public registry data.