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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 45.112.132.0/22 | 1k | APNIC |  CN | 2nd Mar 2015 |
| 45.112.188.0/22 | 1k | APNIC | CN | 4th Mar 2015 |
| 45.112.208.0/22 | 1k | APNIC | CN | 6th Mar 2015 |
| 45.112.212.0/22 | 1k | APNIC | CN | 6th Mar 2015 |
| 45.112.216.0/22 | 1k | APNIC | CN | 6th Mar 2015 |
| 45.112.220.0/22 | 1k | APNIC | CN | 6th Mar 2015 |
| 45.112.228.0/22 | 1k | APNIC | CN | 6th Mar 2015 |
| 45.112.236.0/22 | 1k | APNIC | CN | 6th Mar 2015 |
| 45.113.12.0/22 | 1k | APNIC | CN | 11th Mar 2015 |
| 45.113.144.0/22 | 1k | APNIC | CN | 20th Mar 2015 |
| 45.113.148.0/22 | 1k | APNIC | CN | 20th Mar 2015 |
| 45.113.16.0/22 | 1k | APNIC | CN | 11th Mar 2015 |
| 45.113.168.0/22 | 1k | APNIC | CN | 23rd Mar 2015 |
| 45.113.176.0/22 | 1k | APNIC | CN | 23rd Mar 2015 |
| 45.113.184.0/22 | 1k | APNIC | CN | 23rd Mar 2015 |
| 45.113.208.0/22 | 1k | APNIC | CN | 24th Mar 2015 |
| 45.113.212.0/22 | 1k | APNIC | CN | 24th Mar 2015 |
| 45.113.216.0/22 | 1k | APNIC | CN | 24th Mar 2015 |
| 45.113.220.0/22 | 1k | APNIC | CN | 24th Mar 2015 |
| 45.113.240.0/22 | 1k | APNIC | CN | 25th Mar 2015 |
| 45.113.252.0/22 | 1k | APNIC | CN | 26th Mar 2015 |
| 45.113.28.0/22 | 1k | APNIC | CN | 11th Mar 2015 |
| 45.113.52.0/22 | 1k | APNIC | CN | 12th Mar 2015 |
| 45.113.56.0/22 | 1k | APNIC | CN | 12th Mar 2015 |
| 45.113.72.0/22 | 1k | APNIC | CN | 16th Mar 2015 |
| 45.114.0.0/22 | 1k | APNIC | CN | 26th Mar 2015 |
| 45.114.136.0/22 | 1k | APNIC | CN | 3rd Apr 2015 |
| 45.114.196.0/22 | 1k | APNIC | CN | 8th Apr 2015 |
| 45.114.200.0/22 | 1k | APNIC | CN | 8th Apr 2015 |
| 45.114.228.0/22 | 1k | APNIC | CN | 9th Apr 2015 |
| 45.114.252.0/22 | 1k | APNIC | CN | 13th Apr 2015 |
| 45.114.32.0/22 | 1k | APNIC | CN | 27th Mar 2015 |
| 45.114.40.0/22 | 1k | APNIC | CN | 30th Mar 2015 |
| 45.114.52.0/22 | 1k | APNIC | CN | 30th Mar 2015 |
| 45.114.96.0/22 | 1k | APNIC | CN | 31st Mar 2015 |
| 45.115.100.0/22 | 1k | APNIC | CN | 17th Apr 2015 |
| 45.115.120.0/22 | 1k | APNIC | CN | 20th Apr 2015 |
| 45.115.132.0/22 | 1k | APNIC | CN | 21st Apr 2015 |
| 45.115.156.0/22 | 1k | APNIC | CN | 23rd Apr 2015 |
| 45.115.18.0/23 | 512 | APNIC | CN | 7th Aug 2025 |
| 45.115.212.0/22 | 1k | APNIC | CN | 24th Apr 2015 |
| 45.115.244.0/22 | 1k | APNIC | CN | 27th Apr 2015 |
| 45.115.248.0/22 | 1k | APNIC | CN | 27th Apr 2015 |
| 45.116.16.0/22 | 1k | APNIC | CN | 28th Apr 2015 |
| 45.116.24.0/22 | 1k | APNIC | CN | 28th Apr 2015 |
| 45.116.36.0/22 | 1k | APNIC | CN | 29th Apr 2015 |
| 45.116.96.0/22 | 1k | APNIC | CN | 4th May 2015 |
| 45.117.124.0/22 | 1k | APNIC | CN | 20th May 2015 |
| 45.117.20.0/22 | 1k | APNIC | CN | 14th May 2015 |
| 45.117.252.0/22 | 1k | APNIC | CN | 22nd May 2015 |