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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,075 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 177.39.4.0/22 | 1k | LACNIC |  BR | 4th Mar 2011 |
| 177.4.96.0/20 | 4.1k | APNIC |  IN | 13th Mar 2025 |
| 177.52.38.0/23 | 512 | LACNIC | BR | 23rd Jul 2020 |
| 177.52.56.0/22 | 1k | LACNIC | BR | 19th Sept 2012 |
| 177.53.188.0/24 | 256 | LACNIC | BR | 26th Dec 2011 |
| 177.67.249.0/24 | 256 | LACNIC | BR | 26th Aug 2011 |
| 177.67.251.0/24 | 256 | LACNIC | BR | 30th Aug 2011 |
| 177.67.252.0/24 | 256 | LACNIC | BR | 16th Aug 2011 |
| 177.67.255.0/24 | 256 | LACNIC | BR | 20th Oct 2011 |
| 177.7.160.0/20 | 4.1k | APNIC | IN | 13th Mar 2025 |
| 177.7.224.0/20 | 4.1k | APNIC | IN | 13th Mar 2025 |
| 177.71.96.0/22 | 1k | LACNIC |  AR | 31st Oct 2022 |
| 177.72.255.0/24 | 256 | LACNIC | BR | 13th Dec 2011 |
| 177.73.41.0/24 | 256 | LACNIC | BR | 1st Apr 2020 |
| 177.75.176.0/20 | 4.1k | LACNIC | BR | 22nd Sept 2011 |
| 177.84.184.0/21 | 2k | LACNIC | BR | 26th Dec 2013 |
| 177.84.228.0/22 | 1k | LACNIC | BR | 24th Jan 2013 |
| 177.85.239.0/24 | 256 | LACNIC | BR | 16th Oct 2012 |
| 177.86.224.0/22 | 1k | LACNIC | BR | 17th Nov 2011 |
| 177.87.250.0/23 | 512 | LACNIC | AR | 21st Jul 2020 |
| 177.91.136.0/22 | 1k | LACNIC | BR | 4th Dec 2013 |
| 177.91.4.0/22 | 1k | LACNIC | BR | 26th Nov 2013 |
| 177.93.120.0/21 | 2k | LACNIC | BR | 15th May 2014 |
| 178.100.0.0/14 | 262k | APNIC |  SG | 18th Nov 2009 |
| 178.106.0.0/16 | 65.5k | APNIC | SG | 18th Nov 2009 |
| 178.107.32.0/20 | 4.1k | APNIC |  HK | 18th Nov 2009 |
| 178.107.48.0/20 | 4.1k | RIPE NCC |  GB | 18th Nov 2009 |
| 178.107.64.0/18 | 16.4k | RIPE NCC | GB | 18th Nov 2009 |
| 178.108.0.0/14 | 262k | RIPE NCC |  SE | 18th Nov 2009 |
| 178.130.130.0/24 | 256 | RIPE NCC |  RU | 15th Mar 2010 |
| 178.132.240.0/21 | 2k | RIPE NCC |  DE | 3rd Oct 2011 |
| 178.159.36.0/24 | 256 | RIPE NCC | RU | 25th Aug 2010 |
| 178.16.229.0/24 | 256 | RIPE NCC |  TR | 10th Mar 2010 |
| 178.16.236.0/24 | 256 | RIPE NCC | TR | 10th Mar 2010 |
| 178.169.32.0/19 | 8.2k | RIPE NCC | RU | 26th Mar 2010 |
| 178.17.240.0/24 | 256 | RIPE NCC |  IS | 7th Apr 2010 |
| 178.170.222.0/24 | 256 | RIPE NCC | RU | 31st Mar 2010 |
| 178.170.238.0/23 | 512 | RIPE NCC |  GI | 31st Mar 2010 |
| 178.170.240.0/23 | 512 | RIPE NCC | GI | 31st Mar 2010 |
| 178.175.182.0/23 | 512 | RIPE NCC |  CY | 4th May 2010 |
| 178.18.112.0/22 | 1k | RIPE NCC | GB | 13th Apr 2010 |
| 178.18.118.0/24 | 256 | RIPE NCC | GB | 13th Apr 2010 |
| 178.20.204.0/24 | 256 | RIPE NCC |  RS | 4th Mar 2010 |
| 178.20.240.0/21 | 2k | RIPE NCC |  FR | 8th Mar 2010 |
| 178.20.8.0/21 | 2k | RIPE NCC | DE | 16th Feb 2010 |
| 178.210.163.0/24 | 256 | RIPE NCC |  AE | 18th Jun 2010 |
| 178.211.129.0/24 | 256 | RIPE NCC |  SK | 25th Jan 2022 |
| 178.211.144.0/24 | 256 | RIPE NCC |  IM | 25th Jan 2022 |
| 178.211.145.0/24 | 256 | RIPE NCC |  IR | 25th Jan 2022 |
| 178.211.156.0/24 | 256 | RIPE NCC | TR | 25th Jan 2022 |