222.203.0.0/16
China Education and Research Network CenterAS4538
CERNET2 IX at South China University of TechnologyAS24357
Announced by more than one origin AS (MOAS).
At a glance
Addresses
/16 block
Visibility
78 of 80 vantage points
RPKI
Registry
CNAllocated 7th July 2004
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.
- Amsterdam453823764213151This path
- London, UK4538237648529This path
- Singapore453823764132337This path
- Sao Paulo4538237643356266213This path
- Oregon, US45384635693920130This 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
- APNIC — Asia-Pacific
- Country
- China
- Allocated
- 7th July 2004
- Allocation block
- 222.200.0.0/14
- Status
- allocated
- Origin validation
- No ROA
No ROA covers this prefix, so RPKI has nothing to say about it either way. This is still the common case for a large share of the routing table.
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 |
|---|---|---|---|
| 222.192.0.0/12 | 1M | AS4538China Education and Research Network Center | 79/80 |
More specific announcements
Sibling prefixes
| Prefix | Addresses | Origin | Visibility |
|---|---|---|---|
| 222.202.0.0/16 | 65.5k | AS4538China Education and Research Network Center | 78/80 |
| 222.202.0.0/16 | 65.5k | AS24357CERNET2 IX at South China University of Technology | 2/80 |
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.
Open 222.203.0.0/16 in the calculator/16 reference
Routing data derived from RouteViews MRT archives and public registry data.