AS27313Spencer Stuart
United StatesRegistryARINAs of 13th November 2026, AS27313 (Spencer Stuart), a network registered in the United States with ARIN, originates 4 IPv4 prefixes covering 1k addresses. By IPv4 address space that makes it the 36,533rd-largest of the 80,825 networks we see originating IPv4, and the 8,246th-largest of 18,772 in the United States. It is seen behind 4 upstream networks, most often AS16509 (Amazon.com, Inc.) and AS14618 (Amazon.com, Inc.). 50% of its announcements have a valid RPKI ROA, and none are RPKI-invalid. 50% 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 AS27313 is seen behind, one and two hops out, drawn from real AS paths.
Networks observed one and two hops upstream of AS27313 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
8
adjacent networks
- Upstreams
- 450%
- Peers
- 450%
- Downstreams
- 00%
Networks carrying this one's traffic toward the rest of the internet.
| Network | Country | Relationship | Paths | Vantage pts |
|---|---|---|---|---|
| AS16509Amazon.com, Inc. | US | Peer | 78 | 78 |
| AS14618Amazon.com, Inc. | US | Peer | 78 | 78 |
| AS3356Lumen (Level 3) | US | Peer | 1 | 1 |
| AS174Cogent Communications, LLC | US | Peer | 1 | 1 |
Prefixes
The largest blocks AS27313 originates, widest first.
| Prefix | Addresses | Visibility |
|---|---|---|
| 204.79.137.0/24 | 256 | 78/78 |
| 204.79.138.0/24 | 256 | 1/78 |
| 204.79.140.0/24 | 256 | 78/78 |
| 204.79.172.0/24 | 256 | 1/78 |
Routing health
How AS27313'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
- Valid50.0%2
- Invalid0.0%0
- No ROA50.0%2
Propagation
- Globally propagated90% of full-feed peers or more50.0%2
- Partially propagated40% to 90%0.0%0
- Seen by few peersUnder 40%50.0%2
Prefix sizes
IPv4 — 4 prefixes
Recent changes
Announcements that started or stopped since 14th Oct 2026.
No announcement by AS27313 started or stopped in this period.
Routing data derived from RouteViews MRT archives, BGPKIT relationship inference and public registry data.