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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
84,619 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 61.44.3.0/24 | 256 | APNIC |  JP | 28th Aug 2003 |
| 61.44.4.0/22 | 1k | APNIC | JP | 28th Aug 2003 |
| 61.44.67.0/24 | 256 | APNIC | JP | 26th Sept 2003 |
| 61.44.8.0/21 | 2k | APNIC | JP | 28th Aug 2003 |
| 61.45.128.0/18 | 16.4k | APNIC |  CN | 31st Jan 2005 |
| 61.45.224.0/20 | 4.1k | APNIC | CN | 12th Apr 2011 |
| 61.45.248.0/23 | 512 | APNIC |  AU | 27th Sept 2010 |
| 61.45.250.0/24 | 256 | APNIC | AU | 7th Apr 2010 |
| 61.45.251.0/24 | 256 | APNIC | AU | 7th Apr 2010 |
| 61.45.252.0/22 | 1k | APNIC | AU | 7th Apr 2010 |
| 61.47.0.0/24 | 256 | APNIC | JP | 1st Mar 2005 |
| 61.47.102.0/23 | 512 | APNIC | JP | 1st Mar 2005 |
| 61.47.108.0/22 | 1k | APNIC | JP | 1st Mar 2005 |
| 61.47.15.0/24 | 256 | APNIC | JP | 1st Mar 2005 |
| 61.47.17.0/24 | 256 | APNIC | JP | 1st Mar 2005 |
| 61.47.20.0/24 | 256 | APNIC |  SG | 1st Mar 2005 |
| 61.47.21.0/24 | 256 | APNIC | JP | 1st Mar 2005 |
| 61.47.22.0/24 | 256 | APNIC | JP | 1st Mar 2005 |
| 61.47.24.0/24 | 256 | APNIC | JP | 1st Mar 2005 |
| 61.47.25.0/24 | 256 | APNIC | SG | 1st Mar 2005 |
| 61.47.27.0/24 | 256 | APNIC | JP | 1st Mar 2005 |
| 61.47.29.0/24 | 256 | APNIC | JP | 1st Mar 2005 |
| 61.47.3.0/24 | 256 | APNIC | JP | 1st Mar 2005 |
| 61.47.4.0/23 | 512 | APNIC | JP | 1st Mar 2005 |
| 61.47.44.0/23 | 512 | APNIC | JP | 1st Mar 2005 |
| 61.47.46.0/24 | 256 | APNIC | JP | 1st Mar 2005 |
| 61.47.49.0/24 | 256 | APNIC | JP | 1st Mar 2005 |
| 61.47.50.0/23 | 512 | APNIC | JP | 1st Mar 2005 |
| 61.47.52.0/24 | 256 | APNIC | SG | 1st Mar 2005 |
| 61.47.53.0/24 | 256 | APNIC | JP | 1st Mar 2005 |
| 61.47.54.0/23 | 512 | APNIC | JP | 1st Mar 2005 |
| 61.47.56.0/24 | 256 | APNIC | JP | 1st Mar 2005 |
| 61.47.64.0/23 | 512 | APNIC | JP | 1st Mar 2005 |
| 61.47.66.0/24 | 256 | APNIC | JP | 1st Mar 2005 |
| 61.47.67.0/24 | 256 | APNIC | SG | 1st Mar 2005 |
| 61.47.72.0/21 | 2k | APNIC | JP | 1st Mar 2005 |
| 61.47.88.0/21 | 2k | APNIC |  HK | 1st Mar 2005 |
| 61.47.98.0/23 | 512 | APNIC | JP | 1st Mar 2005 |
| 61.5.240.0/23 | 512 | APNIC | JP | 28th Jul 2006 |
| 61.5.244.0/24 | 256 | APNIC | JP | 28th Jul 2006 |
| 61.67.112.0/21 | 2k | APNIC |  TW | 21st Feb 2001 |
| 61.67.122.0/23 | 512 | APNIC | TW | 21st Feb 2001 |
| 61.67.124.0/22 | 1k | APNIC | TW | 21st Feb 2001 |
| 61.67.96.0/20 | 4.1k | APNIC | TW | 21st Feb 2001 |
| 61.8.160.0/20 | 4.1k | APNIC | CN | 7th Aug 2006 |
| 61.87.12.0/23 | 512 | APNIC | JP | 26th Sept 2003 |
| 61.87.8.0/22 | 1k | APNIC | JP | 26th Sept 2003 |
| 61.9.96.0/19 | 8.2k | APNIC |  PH | 26th Nov 1999 |
| 62.106.65.0/24 | 256 | RIPE NCC |  DE | 7th Oct 2021 |
| 62.106.79.0/24 | 256 | RIPE NCC |  CZ | 7th Oct 2021 |