AS398256Ultahost, Inc.
United StatesRegistryARINAs of 10th November 2026, AS398256 (Ultahost, Inc.), a network registered in the United States with ARIN, originates 16 IPv4 prefixes covering 4.1k addresses. By IPv4 address space that makes it the 17,375th-largest of the 80,733 networks we see originating IPv4, and the 4,863rd-largest of 18,751 in the United States. It is seen behind 3 upstream networks, most often AS1299 (Arelion (fka. Telia Carrier)) and AS174 (Cogent Communications, LLC). 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, and 1 prefix is also originated by another network.
At a glance
IPv4 prefixes
IPv6 prefixes
IPv4 addresses
IPv6 /64s
Upstream graph
The networks AS398256 is seen behind, one and two hops out, drawn from real AS paths.
Networks observed one and two hops upstream of AS398256 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
7
adjacent networks
- Upstreams
- 343%
- Peers
- 457%
- Downstreams
- 00%
Networks carrying this one's traffic toward the rest of the internet.
| Network | Country | Relationship | Paths | Vantage pts |
|---|---|---|---|---|
| AS1299Arelion (fka. Telia Carrier) |  SE | Peer | 732 | 76 |
| AS174Cogent Communications, LLC | US | Peer | 400 | 75 |
| AS394177Shift Hosting LLC | US | Peer | 76 | 76 |
Prefixes
The largest blocks AS398256 originates, widest first.
| Prefix | Addresses | Visibility |
|---|---|---|
| 51.241.125.0/24 | 256 | 76/76 |
| 64.84.57.0/24 | 256 | 74/76 |
| 64.204.80.0/24 | 256 | 76/76 |
| 67.210.97.0/24 | 256 | 76/76 |
| 82.27.71.0/24 | 256 | 75/76 |
| 82.27.78.0/24 | 256 | 75/76 |
| 96.62.77.0/24 | 256 | 75/76 |
| 104.145.210.0/24 | 256 | 76/76 |
| 151.241.99.0/24 | 256 | 76/76 |
| 151.241.117.0/24 | 256 | 75/76 |
Routing health
How AS398256'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%16
- Invalid0.0%0
- No ROA0.0%0
Propagation
- Globally propagated90% of full-feed peers or more100.0%16
- Partially propagated40% to 90%0.0%0
- Seen by few peersUnder 40%0.0%0
Prefix sizes
IPv4 — 16 prefixes
Recent changes
Announcements that started or stopped since 12th Oct 2026.
- Announced64.84.57.0/2419th Oct 2026
Routing data derived from RouteViews MRT archives, BGPKIT relationship inference and public registry data.