subnet.im

221.231.0.0/16

Not announced at this prefix length

We do not see 221.231.0.0/16 announced as its own route. The most specific announcement covering it is 221.224.0.0/13, originated by AS4134 (China Telecom Backbone). Traffic to addresses in this block follows that route.

At a glance

Addresses

65,536

/16 block

Visibility

Unknown

RPKI

Unknown

Registry

APNICCN

Allocated 26th June 2003

AS paths to this prefix

No AS paths are stored for this prefix. We keep the full path from one reference peer per collector rather than from every peer, so a prefix only has paths here once it has been seen by one of those peers.

Registry and RPKI

RIR
APNIC — Asia-Pacific
Country
China
Allocated
26th June 2003
Allocation block
221.224.0.0/13
Status
allocated
Origin validation
Unknown

ROAs covering this prefix

Route Origin Authorisations covering 221.231.0.0/16
ROA prefixAuthorised originMax length
221.224.0.0/13AS4134/13

Prefix hierarchy

Announcements above, below and beside this one in the real routing table.

CoveringMore specific
Prefix hierarchy for 221.231.0.0/16: the announcements covering it on the left, the announcements inside it on the right. Every prefix drawn is also listed in the tables below.221.224.0.0/13AS4134221.231.0.0/16This prefix221.231.128.0/21AS137702221.231.136.0/21AS137702221.231.12.0/24AS4809221.231.96.0/24AS4809221.231.98.0/24AS4809+1 more

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

Announcements that contain 221.231.0.0/16
PrefixAddressesOriginVisibility
221.224.0.0/13524kAS4134China Telecom Backbone80/81

Sibling prefixes

No prefix of the same length in the same parent block is announced.

History

  1. AS413426th September 2026 — 26th September 2026
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 221.231.0.0/16 in the calculator/16 reference

Routing data derived from RouteViews MRT archives and public registry data.