240a:a44f::/32
China Education and Research Network CenterAS4538
Announced by more than one origin AS (MOAS).
At a glance
Subnets
/32 block
Visibility
60 of 62 vantage points
RPKI
Registry
CNAllocated 1st April 2021
AS paths to this prefix
All pathsOne observed path, hop by hop, from the origin out to Singapore.
Seen from Singapore
- Peer of AS143753seen on 60 paths from 60 vantage points
- Peer of AS38255seen on 225,483 paths from 135 vantage points
- Peer of AS6939seen on 320,794 paths from 2 vantage points
AU
US
SGOne 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
- Amsterdam143753382556939213151This path
- London, UK14375338255693951907This path
- Sao Paulo14375338255693932590This path
- Singapore143753382556939132337Shown above
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
97%
Seen by 60 of 62 full-feed vantage points
Globally propagatedObserved at 4 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
- APNIC — Asia-Pacific
- Country
- China
- Allocated
- 1st April 2021
- Allocation block
- 240a:a000::/20
- 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.
Covering announcements
No less specific announcement covers this prefix.
More specific announcements
Nothing inside this block is announced separately.
Sibling prefixes
| Prefix | Addresses | Origin | Visibility |
|---|---|---|---|
| 240a:a44e::/32 | 4.3B × /64 | AS4538China Education and Research Network Center | 2/62 |
| 240a:a44e::/32 | 4.3B × /64 | AS143752APNIC ASN block | 60/62 |
History
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.
Routing data derived from RouteViews MRT archives and public registry data.