161.8.192.0/21
At a glance
Addresses
/21 block
Visibility
80 of 80 vantage points
RPKI
Registry
USAllocated 4th May 1992
AS paths to this prefix
One real path per vantage point, fanning out from the origin. Where two reach the prefix the same way, those hops are drawn once. Open a path to follow it hop by hop.
- Singapore585076939132337This path
- Oregon, US58507693920130This path
- Sao Paulo5850729143356266213This path
- London, UK585077474747364618529This path
- Amsterdam5850774747473646134549213151This path
Each row is one path genuinely present in the routing table at our last snapshot, read outward from the origin to the vantage point that saw it. Open a row to follow that one path hop by hop. A heavier line in the graph means more vantage points reach the prefix that same way.
Route visibility
100%
Seen by 80 of 80 full-feed vantage points
Globally propagatedObserved at 5 of our collectors.
What this percentage counts
The denominator counts only full-feed peers — peers carrying a substantially complete routing table at the moment of the snapshot. IXP route-server peers usually feed partial tables and are excluded, because including them would make a normally propagated prefix look as though half the internet could not see it.
It measures how widely an announcement has spread across the networks we can observe. It says nothing about whether the prefix is reachable from any particular place, or how it performs.
Registry and RPKI
- RIR
- RIPE NCC — Europe, Middle East, Central Asia
- Country
- United States
- Allocated
- 4th May 1992
- Allocation block
- 161.8.0.0/16
- Status
- assigned
- Origin validation
- Valid
A ROA exists that authorises this origin AS to announce this prefix at this length.
ROAs covering this prefix
| ROA prefix | Authorised origin | Max length |
|---|---|---|
| 161.8.192.0/18 | AS58507 | /24 |
Prefix hierarchy
Announcements above, below and beside this one in the real routing table.
Left to right is specificity: a shorter mask covering more address space, then this prefix, then the announcements carved out inside it. Only the first few of each are drawn — the tables below list them all.
Covering announcements
| Prefix | Addresses | Origin | Visibility |
|---|---|---|---|
| 161.8.192.0/18 | 16.4k | AS58507Wireline | 79/80 |
More specific announcements
| Prefix | Addresses | Origin | Visibility |
|---|---|---|---|
| 161.8.192.0/22 | 1k | AS58507Wireline | 15/80 |
| 161.8.196.0/22 | 1k | AS58507Wireline | 15/80 |
Sibling prefixes
No prefix of the same length in the same parent block is announced.
History
- AS5850712th August 2026 — present
Why these dates start where they do
A first-seen date is the first time we saw that origin, not the first time it appeared in BGP. Our history is forward-only with no backfill, so it says nothing about the period before we started collecting — treat the earliest dates with suspicion.
Open 161.8.192.0/21 in the calculator/21 reference
Routing data derived from RouteViews MRT archives and public registry data.