50.205.36.0/23
At a glance
Addresses
/23 block
Visibility
78 of 80 vantage points
RPKI
Registry
USAllocated 21st October 2010
AS paths to this prefix
All pathsOne observed path, hop by hop, from the origin out to Oregon, US.
Seen from Oregon, US
- Peer of AS7725seen on 12,969 paths from 141 vantage points
- Peer of AS7922seen on 36,274 paths from 19 vantage points
- Peer of AS6939seen on 975,334 paths from 1 vantage point
One path, hop by hop, from the origin outward to the vantage point that saw it. Counts beside each step are how often we see that pair adjacent anywhere in the table, not how often this path was used — BGP carries no traffic figures.
Every path we see
- London, UK7725792212998529This path
- Oregon, US77257922693920130Shown above
- Amsterdam7725792217434549213151This path
- Sao Paulo77257922174262355266213This path
- Singapore7725792264539002132337This 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
98%
Seen by 78 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
- ARIN — North America
- Country
- United States
- Allocated
- 21st October 2010
- Allocation block
- 50.128.0.0/9
- Status
- allocated
- Origin validation
- Valid
A ROA exists that authorises this origin AS to announce this prefix at this length.
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 |
|---|---|---|---|
| 50.128.0.0/9 | 8.4M | AS7922Comcast Cable Communications, LLC | 77/80 |
More specific announcements
Nothing inside this block is announced separately.
Sibling prefixes
No prefix of the same length in the same parent block is announced.
History
- AS772512th 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 50.205.36.0/23 in the calculator/23 reference
Routing data derived from RouteViews MRT archives and public registry data.