AS30356Blue Cross Blue Shield of Michigan Mutual Insurance
United StatesRegistryARINAs of 24th October 2026, AS30356 (Blue Cross Blue Shield of Michigan…), a network registered in the United States with ARIN, originates 9 IPv4 prefixes covering 100k addresses. By IPv4 address space that makes it the 2,387th-largest of the 79,642 networks we see originating IPv4, and the 762nd-largest of 18,487 in the United States. It is seen behind 2 upstream networks, most often AS7018 (AT&T Enterprises, LLC) and AS3356 (Lumen (Level 3)). None of its announcements have a valid RPKI ROA. 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 AS30356 is seen behind, one and two hops out, drawn from real AS paths.
Networks observed one and two hops upstream of AS30356 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
5
adjacent networks
- Upstreams
- 240%
- Peers
- 360%
- Downstreams
- 00%
Networks carrying this one's traffic toward the rest of the internet.
| Network | Country | Relationship | Paths | Vantage pts |
|---|---|---|---|---|
| AS7018AT&T Enterprises, LLC | US | Peer | 456 | 76 |
| AS3356Lumen (Level 3) | US | Peer | 228 | 76 |
Prefixes
The largest blocks AS30356 originates, widest first.
| Prefix | Addresses | Visibility |
|---|---|---|
| 167.242.0.0/16 | 65.5k | 76/76 |
| 167.242.128.0/17 | 32.8k | 76/76 |
| 12.107.172.0/24 | 256 | 76/76 |
| 12.176.249.0/24 | 256 | 76/76 |
| 12.231.98.0/24 | 256 | 76/76 |
| 167.242.45.0/24 | 256 | 76/76 |
| 167.242.46.0/24 | 256 | 76/76 |
| 167.242.123.0/24 | 256 | 76/76 |
| 167.242.124.0/24 | 256 | 76/76 |
Routing health
How AS30356'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%9
Propagation
- Globally propagated90% of full-feed peers or more100.0%9
- Partially propagated40% to 90%0.0%0
- Seen by few peersUnder 40%0.0%0
Prefix sizes
Recent changes
Announcements that started or stopped since 24th Sept 2026.
No announcement by AS30356 started or stopped in this period.
Routing data derived from RouteViews MRT archives, BGPKIT relationship inference and public registry data.