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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 45.255.240.0/22 | 1k | APNIC |  CN | 8th Jun 2016 |
| 45.255.244.0/22 | 1k | APNIC | CN | 8th Jun 2016 |
| 45.255.248.0/22 | 1k | APNIC | CN | 8th Jun 2016 |
| 45.255.28.0/22 | 1k | APNIC | CN | 7th Jun 2016 |
| 45.255.32.0/22 | 1k | APNIC | CN | 7th Jun 2016 |
| 45.255.36.0/22 | 1k | APNIC | CN | 7th Jun 2016 |
| 45.255.4.0/22 | 1k | APNIC | CN | 7th Jun 2016 |
| 45.255.40.0/22 | 1k | APNIC | CN | 7th Jun 2016 |
| 45.255.44.0/22 | 1k | APNIC | CN | 7th Jun 2016 |
| 45.255.48.0/22 | 1k | APNIC | CN | 7th Jun 2016 |
| 45.255.52.0/22 | 1k | APNIC | CN | 7th Jun 2016 |
| 45.255.56.0/22 | 1k | APNIC | CN | 7th Jun 2016 |
| 45.255.60.0/22 | 1k | APNIC | CN | 7th Jun 2016 |
| 45.255.64.0/22 | 1k | APNIC | CN | 7th Jun 2016 |
| 45.255.68.0/22 | 1k | APNIC | CN | 7th Jun 2016 |
| 45.255.72.0/22 | 1k | APNIC | CN | 7th Jun 2016 |
| 45.255.76.0/22 | 1k | APNIC | CN | 7th Jun 2016 |
| 45.255.8.0/22 | 1k | APNIC | CN | 7th Jun 2016 |
| 45.255.80.0/22 | 1k | APNIC | CN | 7th Jun 2016 |
| 45.255.84.0/22 | 1k | APNIC | CN | 7th Jun 2016 |
| 45.255.88.0/22 | 1k | APNIC | CN | 7th Jun 2016 |
| 45.255.92.0/22 | 1k | APNIC | CN | 7th Jun 2016 |
| 45.255.96.0/22 | 1k | APNIC | CN | 7th Jun 2016 |
| 45.65.16.0/22 | 1k | APNIC | CN | 3rd Mar 2016 |
| 45.65.24.0/22 | 1k | APNIC | CN | 3rd Mar 2016 |
| 45.65.28.0/22 | 1k | APNIC | CN | 3rd Mar 2016 |
| 49.128.0.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 49.128.2.0/23 | 512 | APNIC | CN | 14th Apr 2011 |
| 49.128.4.0/22 | 1k | APNIC | CN | 5th Nov 2015 |
| 49.152.0.0/14 | 262k | APNIC | CN | 23rd Nov 2010 |
| 49.213.60.0/23 | 512 | APNIC | CN | 18th Aug 2025 |
| 49.239.0.0/19 | 8.2k | APNIC | CN | 6th Dec 2010 |
| 49.239.32.0/20 | 4.1k | APNIC | CN | 6th Dec 2010 |
| 49.239.48.0/21 | 2k | APNIC | CN | 6th Dec 2010 |
| 49.239.56.0/22 | 1k | APNIC | CN | 6th Dec 2010 |
| 49.239.60.0/23 | 512 | APNIC | CN | 6th Dec 2010 |
| 49.239.62.0/23 | 512 | APNIC | CN | 6th Dec 2010 |
| 49.5.0.0/16 | 65.5k | APNIC | CN | 22nd Sept 2010 |
| 57.176.0.0/15 | 131k | APNIC | CN | 21st Jun 1993 |
| 58.65.232.0/21 | 2k | APNIC | CN | 12th Apr 2011 |
| 58.83.0.0/17 | 32.8k | APNIC | CN | 30th Mar 2005 |
| 59.107.128.0/17 | 32.8k | APNIC | CN | 22nd Mar 2006 |
| 59.152.112.0/22 | 1k | APNIC | CN | 26th Nov 2015 |
| 59.152.116.0/22 | 1k | APNIC | CN | 26th Nov 2015 |
| 59.152.16.0/22 | 1k | APNIC | CN | 26th Nov 2015 |
| 59.152.20.0/22 | 1k | APNIC | CN | 26th Nov 2015 |
| 59.152.24.0/22 | 1k | APNIC | CN | 26th Nov 2015 |
| 59.152.28.0/22 | 1k | APNIC | CN | 26th Nov 2015 |
| 59.152.32.0/22 | 1k | APNIC | CN | 30th Dec 2015 |
| 59.152.64.0/22 | 1k | APNIC | CN | 26th Nov 2015 |