AS18933T-Mobile USA, Inc.
United StatesRegistryARINAs of 11th November 2026, AS18933 (T-Mobile USA, Inc.), a network registered in the United States with ARIN, originates 14 IPv4 prefixes covering 93.2k addresses. By IPv4 address space that makes it the 2,544th-largest of the 80,747 networks we see originating IPv4, and the 821st-largest of 18,752 in the United States. It is seen behind 1 upstream network, most often AS6614 (T-Mobile USA, Inc.). None of its announcements have a valid RPKI ROA. 86% of its routes reach at least 90% of full-feed peers, and 2 prefixes are also originated by another network.
At a glance
IPv4 prefixes
IPv6 prefixes
IPv4 addresses
IPv6 /64s
Upstream graph
The networks AS18933 is seen behind, one and two hops out, drawn from real AS paths.
Networks observed one and two hops upstream of AS18933 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
2
adjacent networks
- Upstreams
- 150%
- Peers
- 150%
- Downstreams
- 00%
Networks carrying this one's traffic toward the rest of the internet.
| Network | Country | Relationship | Paths | Vantage pts |
|---|---|---|---|---|
| AS6614T-Mobile USA, Inc. | US | Peer | 920 | 76 |
Prefixes
The largest blocks AS18933 originates, widest first.
| Prefix | Addresses | Visibility |
|---|---|---|
| 166.182.0.0/16 | 65.5k | 4/76 |
| 166.224.192.0/19 | 8.2k | 76/76 |
| 166.224.224.0/19 | 8.2k | 76/76 |
| 166.181.160.0/20 | 4.1k | 76/76 |
| 166.182.160.0/20 | 4.1k | 76/76 |
| 165.27.240.0/22 | 1k | 4/76 |
| 165.27.248.0/24 | 256 | 76/76 |
| 165.27.253.0/24 | 256 | 76/76 |
| 198.227.57.0/24 | 256 | 76/76 |
| 198.227.60.0/24 | 256 | 76/76 |
Routing health
How AS18933'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
- Valid0.0%0
- Invalid0.0%0
- No ROA100.0%14
Propagation
- Globally propagated90% of full-feed peers or more85.7%12
- Partially propagated40% to 90%0.0%0
- Seen by few peersUnder 40%14.3%2
Prefix sizes
Recent changes
Announcements that started or stopped since 12th Oct 2026.
- Announced166.182.0.0/1610th Nov 2026
- Withdrawn166.182.0.0/1630th Oct 2026
- Announced165.27.240.0/2227th Oct 2026
- Withdrawn165.27.240.0/2226th Oct 2026
- Announced165.27.240.0/2213th Oct 2026
- Withdrawn165.27.240.0/2212th Oct 2026
- Announced165.27.240.0/2212th Oct 2026
Routing data derived from RouteViews MRT archives, BGPKIT relationship inference and public registry data.