Allocated but unannounced space
Every block here was allocated or assigned by a regional internet registry, and none of them appeared in any routing table we collected at our last snapshot — neither as a route of their own, nor covered by a larger announcement, nor carved up into more specifics.
“Unannounced” does not mean “unused”
Plenty of allocated space is deliberately kept off the public internet: private interconnects, lab and lawful-intercept ranges, networks reachable only inside one operator, and space held in reserve. Some of it is announced somewhere our collectors cannot see, which is a limit of our vantage points rather than a fact about the block.
It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today. Nothing on this page means a block is unallocated, available, or free to announce.
Browse by registry
Browse by country
Countries with the most unannounced blocks, largest first.
Unannounced blocks in China
6,733 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 203.1.254.0/24 | 256 | APNIC |  CN | 14th Apr 2011 |
| 203.1.26.0/23 | 512 | APNIC | CN | 14th Apr 2011 |
| 203.1.4.0/22 | 1k | APNIC | CN | 14th Apr 2011 |
| 203.1.65.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.1.66.0/23 | 512 | APNIC | CN | 14th Apr 2011 |
| 203.1.70.0/23 | 512 | APNIC | CN | 14th Apr 2011 |
| 203.1.76.0/23 | 512 | APNIC | CN | 14th Apr 2011 |
| 203.1.90.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.1.97.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.1.98.0/23 | 512 | APNIC | CN | 14th Apr 2011 |
| 203.10.125.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.10.34.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.10.56.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.10.74.0/23 | 512 | APNIC | CN | 14th Apr 2011 |
| 203.10.84.0/22 | 1k | APNIC | CN | 14th Apr 2011 |
| 203.10.88.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.10.95.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.100.32.0/20 | 4.1k | APNIC | CN | 27th May 2004 |
| 203.100.58.0/24 | 256 | APNIC | CN | 9th Jun 2016 |
| 203.100.60.0/24 | 256 | APNIC | CN | 9th Jun 2016 |
| 203.100.63.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.100.96.0/19 | 8.2k | APNIC | CN | 12th Jan 2005 |
| 203.105.128.0/19 | 8.2k | APNIC | CN | 12th Apr 2011 |
| 203.105.96.0/19 | 8.2k | APNIC | CN | 12th Apr 2011 |
| 203.11.100.0/22 | 1k | APNIC | CN | 14th Apr 2011 |
| 203.11.109.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.11.117.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.11.122.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.11.126.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.11.136.0/22 | 1k | APNIC | CN | 14th Apr 2011 |
| 203.11.141.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.11.142.0/23 | 512 | APNIC | CN | 14th Apr 2011 |
| 203.11.180.0/22 | 1k | APNIC | CN | 14th Apr 2011 |
| 203.11.208.0/22 | 1k | APNIC | CN | 14th Apr 2011 |
| 203.11.70.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.11.76.0/22 | 1k | APNIC | CN | 14th Apr 2011 |
| 203.11.82.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.11.84.0/22 | 1k | APNIC | CN | 14th Apr 2011 |
| 203.110.234.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.114.80.0/22 | 1k | APNIC | CN | 24th Nov 2015 |
| 203.114.84.0/22 | 1k | APNIC | CN | 24th Nov 2015 |
| 203.114.88.0/22 | 1k | APNIC | CN | 24th Nov 2015 |
| 203.114.92.0/22 | 1k | APNIC | CN | 24th Nov 2015 |
| 203.118.192.0/19 | 8.2k | APNIC | CN | 27th May 2004 |
| 203.118.241.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.119.113.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.119.116.0/22 | 1k | APNIC | CN | 14th Apr 2011 |
| 203.119.85.0/24 | 256 | APNIC | CN | 5th Mar 2010 |
| 203.12.100.0/23 | 512 | APNIC | CN | 14th Apr 2011 |
| 203.12.103.0/24 | 256 | APNIC | CN | 14th Apr 2011 |