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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
6,735 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 103.244.84.0/22 | 1k | APNIC |  CN | 12th Dec 2012 |
| 103.245.124.0/22 | 1k | APNIC | CN | 11th Jan 2013 |
| 103.245.23.0/24 | 256 | APNIC | CN | 7th Jan 2013 |
| 103.245.52.0/22 | 1k | APNIC | CN | 7th Jan 2013 |
| 103.245.60.0/22 | 1k | APNIC | CN | 8th Jan 2013 |
| 103.245.80.0/22 | 1k | APNIC | CN | 22nd Jan 2013 |
| 103.246.12.0/22 | 1k | APNIC | CN | 29th Jun 2011 |
| 103.246.120.0/22 | 1k | APNIC | CN | 17th May 2011 |
| 103.246.124.0/22 | 1k | APNIC | CN | 17th May 2011 |
| 103.246.132.0/22 | 1k | APNIC | CN | 23rd Aug 2011 |
| 103.246.8.0/22 | 1k | APNIC | CN | 29th Jun 2011 |
| 103.247.172.0/22 | 1k | APNIC | CN | 1st Feb 2012 |
| 103.247.200.0/22 | 1k | APNIC | CN | 6th Feb 2012 |
| 103.247.212.0/22 | 1k | APNIC | CN | 7th Feb 2012 |
| 103.248.0.0/23 | 512 | APNIC | CN | 10th May 2013 |
| 103.248.100.0/22 | 1k | APNIC | CN | 17th May 2013 |
| 103.248.124.0/22 | 1k | APNIC | CN | 20th May 2013 |
| 103.248.168.0/22 | 1k | APNIC | CN | 21st May 2013 |
| 103.248.192.0/22 | 1k | APNIC | CN | 23rd May 2013 |
| 103.248.212.0/22 | 1k | APNIC | CN | 24th May 2013 |
| 103.249.12.0/22 | 1k | APNIC | CN | 28th May 2013 |
| 103.249.128.0/22 | 1k | APNIC | CN | 6th Jun 2013 |
| 103.249.144.0/22 | 1k | APNIC | CN | 6th Jun 2013 |
| 103.249.164.0/22 | 1k | APNIC | CN | 7th Jun 2013 |
| 103.249.168.0/22 | 1k | APNIC | CN | 7th Jun 2013 |
| 103.249.172.0/22 | 1k | APNIC | CN | 7th Jun 2013 |
| 103.249.176.0/22 | 1k | APNIC | CN | 7th Jun 2013 |
| 103.249.188.0/22 | 1k | APNIC | CN | 7th Jun 2013 |
| 103.249.192.0/22 | 1k | APNIC | CN | 7th Jun 2013 |
| 103.249.52.0/22 | 1k | APNIC | CN | 31st May 2013 |
| 103.249.8.0/22 | 1k | APNIC | CN | 6th Nov 2015 |
| 103.25.148.0/22 | 1k | APNIC | CN | 2nd May 2013 |
| 103.25.216.0/22 | 1k | APNIC | CN | 8th May 2013 |
| 103.25.28.0/22 | 1k | APNIC | CN | 26th Apr 2013 |
| 103.25.32.0/22 | 1k | APNIC | CN | 26th Apr 2013 |
| 103.25.40.0/22 | 1k | APNIC | CN | 26th Apr 2013 |
| 103.25.48.0/22 | 1k | APNIC | CN | 26th Apr 2013 |
| 103.25.68.0/22 | 1k | APNIC | CN | 29th Apr 2013 |
| 103.250.180.0/22 | 1k | APNIC | CN | 19th Jul 2013 |
| 103.250.224.0/22 | 1k | APNIC | CN | 23rd Jul 2013 |
| 103.250.236.0/22 | 1k | APNIC | CN | 24th Jul 2013 |
| 103.251.192.0/22 | 1k | APNIC | CN | 10th Nov 2015 |
| 103.252.104.0/22 | 1k | APNIC | CN | 25th Oct 2013 |
| 103.252.204.0/22 | 1k | APNIC | CN | 4th Nov 2013 |
| 103.252.208.0/22 | 1k | APNIC | CN | 4th Nov 2013 |
| 103.252.232.0/22 | 1k | APNIC | CN | 5th Nov 2013 |
| 103.252.248.0/22 | 1k | APNIC | CN | 6th Nov 2013 |
| 103.252.28.0/22 | 1k | APNIC | CN | 22nd Oct 2013 |
| 103.252.64.0/22 | 1k | APNIC | CN | 24th Oct 2013 |
| 103.252.96.0/22 | 1k | APNIC | CN | 29th Jun 2016 |