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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
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Countries with the most unannounced blocks, largest first.
Unannounced blocks
84,960 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 121.101.136.0/21 | 2k | APNIC |  AU | 15th Nov 2007 |
| 121.101.144.0/20 | 4.1k | APNIC |  US | 16th Nov 2007 |
| 121.101.208.0/20 | 4.1k | APNIC |  CN | 20th Nov 2007 |
| 121.127.36.0/24 | 256 | RIPE NCC |  BG | 9th Oct 2007 |
| 121.200.192.0/21 | 2k | APNIC | CN | 12th Apr 2011 |
| 121.200.218.0/23 | 512 | APNIC |  PH | 18th Sept 2025 |
| 121.46.112.0/22 | 1k | APNIC |  IN | 27th Jan 2016 |
| 121.46.116.0/22 | 1k | APNIC |  HK | 27th Jan 2016 |
| 121.46.76.0/22 | 1k | APNIC | CN | 26th Jan 2016 |
| 121.46.92.0/22 | 1k | APNIC | IN | 27th Jan 2016 |
| 121.47.0.0/16 | 65.5k | APNIC | CN | 22nd Jun 2006 |
| 121.50.128.0/20 | 4.1k | APNIC |  ID | 15th Jun 2006 |
| 121.50.172.0/22 | 1k | APNIC |  VN | 17th Nov 2015 |
| 121.50.8.0/21 | 2k | APNIC | CN | 12th Apr 2011 |
| 121.52.128.0/21 | 2k | APNIC | ID | 1st Nov 2007 |
| 121.54.176.0/21 | 2k | APNIC | CN | 12th Apr 2011 |
| 121.58.136.0/21 | 2k | APNIC | CN | 12th Apr 2011 |
| 121.58.160.0/21 | 2k | APNIC | CN | 12th Apr 2011 |
| 121.58.168.0/21 | 2k | APNIC | IN | 13th Nov 2007 |
| 121.91.136.0/21 | 2k | APNIC | HK | 26th Nov 2007 |
| 121.91.88.0/21 | 2k | APNIC | HK | 5th Oct 2007 |
| 122.0.128.0/17 | 32.8k | APNIC | CN | 7th Jul 2006 |
| 122.0.8.0/21 | 2k | APNIC |  KR | 26th Sept 2006 |
| 122.10.164.0/22 | 1k | APNIC | CN | 14th Aug 2006 |
| 122.10.168.0/21 | 2k | APNIC | CN | 14th Aug 2006 |
| 122.10.176.0/20 | 4.1k | APNIC | CN | 14th Aug 2006 |
| 122.10.192.0/22 | 1k | APNIC | CN | 14th Aug 2006 |
| 122.10.208.0/21 | 2k | APNIC | CN | 14th Aug 2006 |
| 122.10.216.0/22 | 1k | APNIC | CN | 14th Aug 2006 |
| 122.10.228.0/22 | 1k | APNIC | CN | 14th Aug 2006 |
| 122.10.232.0/21 | 2k | APNIC | CN | 14th Aug 2006 |
| 122.10.240.0/22 | 1k | APNIC | CN | 14th Aug 2006 |
| 122.100.32.0/19 | 8.2k | APNIC | KR | 12th Oct 2006 |
| 122.102.0.0/20 | 4.1k | APNIC | CN | 31st Oct 2006 |
| 122.102.120.0/23 | 512 | APNIC | ID | 11th Aug 2025 |
| 122.102.124.0/23 | 512 | APNIC | IN | 11th Aug 2025 |
| 122.102.80.0/20 | 4.1k | APNIC | CN | 3rd Nov 2006 |
| 122.115.128.0/19 | 8.2k | APNIC | CN | 18th Sept 2007 |
| 122.115.16.0/20 | 4.1k | APNIC | CN | 18th Sept 2007 |
| 122.115.160.0/19 | 8.2k | APNIC | CN | 18th Sept 2007 |
| 122.115.192.0/19 | 8.2k | APNIC | CN | 18th Sept 2007 |
| 122.115.240.0/20 | 4.1k | APNIC | CN | 18th Sept 2007 |
| 122.12.0.0/16 | 65.5k | APNIC | CN | 14th Aug 2006 |
| 122.128.100.0/22 | 1k | APNIC | CN | 17th Nov 2015 |
| 122.128.120.0/21 | 2k | APNIC | CN | 12th Apr 2011 |
| 122.128.80.0/21 | 2k | APNIC |  TW | 15th Dec 2006 |
| 122.129.0.0/18 | 16.4k | APNIC | VN | 11th Apr 2011 |
| 122.129.192.0/21 | 2k | APNIC | ID | 21st Dec 2006 |
| 122.145.112.0/22 | 1k | APNIC |  JP | 5th Jan 2007 |
| 122.145.130.0/24 | 256 | APNIC | JP | 5th Jan 2007 |