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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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.
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Countries with unannounced space registered through APNIC, largest first.
Unannounced blocks registered through APNIC
22,593 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 27.54.72.0/21 | 2k | APNIC |  CN | 12th Apr 2011 |
| 27.96.160.0/19 | 8.2k | APNIC |  KR | 19th May 2010 |
| 27.98.208.0/20 | 4.1k | APNIC | CN | 25th May 2010 |
| 27.99.0.0/17 | 32.8k | APNIC |  AU | 24th May 2010 |
| 31.99.144.0/21 | 2k | APNIC |  US | 25th Nov 2010 |
| 36.0.0.0/22 | 1k | APNIC | CN | 14th Apr 2011 |
| 36.0.128.0/17 | 32.8k | APNIC | CN | 9th Mar 2011 |
| 36.0.16.0/20 | 4.1k | APNIC | CN | 12th Apr 2011 |
| 36.0.32.0/19 | 8.2k | APNIC | CN | 12th Apr 2011 |
| 36.0.4.0/22 | 1k | APNIC |  NP | 16th Mar 2011 |
| 36.0.64.0/18 | 16.4k | APNIC | CN | 11th Mar 2011 |
| 36.0.8.0/21 | 2k | APNIC | CN | 28th Jan 2011 |
| 36.254.0.0/16 | 65.5k | APNIC | CN | 31st Jan 2011 |
| 36.255.120.0/22 | 1k | APNIC |  JP | 18th Feb 2016 |
| 36.255.124.0/22 | 1k | APNIC |  SG | 18th Feb 2016 |
| 36.255.160.0/22 | 1k | APNIC | JP | 22nd Feb 2016 |
| 36.255.172.0/22 | 1k | APNIC | CN | 22nd Feb 2016 |
| 36.255.176.0/22 | 1k | APNIC | CN | 22nd Feb 2016 |
| 36.255.196.0/22 | 1k | APNIC |  IN | 23rd Feb 2016 |
| 36.255.36.0/22 | 1k | APNIC | JP | 11th Feb 2016 |
| 36.3.160.0/19 | 8.2k | APNIC | SG | 1st Feb 2011 |
| 36.37.0.0/19 | 8.2k | APNIC | CN | 12th Apr 2011 |
| 36.37.36.0/23 | 512 | APNIC | CN | 14th Apr 2011 |
| 36.37.38.0/24 | 256 | APNIC | AU | 11th Aug 2011 |
| 36.37.39.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 36.37.40.0/21 | 2k | APNIC | CN | 12th Apr 2011 |
| 36.37.48.0/20 | 4.1k | APNIC | CN | 12th Apr 2011 |
| 36.50.109.0/24 | 256 | APNIC |  ID | 14th Dec 2023 |
| 36.50.120.0/23 | 512 | APNIC | ID | 14th Dec 2023 |
| 36.50.126.0/23 | 512 | APNIC | ID | 15th Dec 2023 |
| 36.50.136.0/23 | 512 | APNIC | ID | 15th Dec 2023 |
| 36.50.16.0/23 | 512 | APNIC |  VN | 27th Nov 2023 |
| 36.50.208.0/23 | 512 | APNIC | VN | 22nd Dec 2023 |
| 36.50.215.0/24 | 256 | APNIC | ID | 22nd Dec 2023 |
| 36.50.216.0/23 | 512 | APNIC | ID | 22nd Dec 2023 |
| 36.50.242.0/23 | 512 | APNIC | ID | 27th Dec 2023 |
| 36.50.244.0/23 | 512 | APNIC | ID | 27th Dec 2023 |
| 36.50.246.0/23 | 512 | APNIC | ID | 28th Dec 2023 |
| 36.50.254.0/23 | 512 | APNIC | CN | 28th Dec 2023 |
| 36.50.28.0/23 | 512 | APNIC | VN | 27th Nov 2023 |
| 36.52.112.0/21 | 2k | APNIC | JP | 3rd Feb 2011 |
| 36.52.120.0/22 | 1k | APNIC | JP | 3rd Feb 2011 |
| 36.52.124.0/23 | 512 | APNIC | JP | 3rd Feb 2011 |
| 36.52.144.0/21 | 2k | APNIC | JP | 3rd Feb 2011 |
| 36.52.16.0/21 | 2k | APNIC | JP | 3rd Feb 2011 |
| 36.52.168.0/22 | 1k | APNIC | JP | 3rd Feb 2011 |
| 36.52.172.0/23 | 512 | APNIC | JP | 3rd Feb 2011 |
| 36.52.224.0/21 | 2k | APNIC | JP | 3rd Feb 2011 |
| 36.52.232.0/22 | 1k | APNIC | JP | 3rd Feb 2011 |
| 36.52.236.0/23 | 512 | APNIC | JP | 3rd Feb 2011 |