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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 176.223.80.0/21 | 2k | RIPE NCC |  IR | 29th Nov 2011 |
| 176.24.0.0/14 | 262k | RIPE NCC |  GB | 19th May 2011 |
| 176.28.56.0/22 | 1k | RIPE NCC |  DE | 20th May 2011 |
| 176.28.62.0/24 | 256 | RIPE NCC | DE | 20th May 2011 |
| 176.28.79.0/24 | 256 | RIPE NCC |  IQ | 20th May 2011 |
| 176.32.248.0/21 | 2k | RIPE NCC |  ES | 26th May 2011 |
| 176.53.144.0/24 | 256 | RIPE NCC |  CY | 18th Jan 2022 |
| 176.53.224.0/19 | 8.2k | RIPE NCC |  RU | 30th May 2011 |
| 176.56.152.0/22 | 1k | RIPE NCC | IR | 30th May 2011 |
| 176.58.64.0/20 | 4.1k | RIPE NCC |  PS | 6th Jun 2011 |
| 176.67.248.0/21 | 2k | ARIN |  CA | 23rd Aug 2023 |
| 176.74.208.0/21 | 2k | RIPE NCC |  NO | 17th Jun 2011 |
| 176.96.192.0/19 | 8.2k | RIPE NCC | ES | 29th Jul 2011 |
| 176.96.72.0/21 | 2k | RIPE NCC |  UA | 19th Jul 2011 |
| 176.97.193.0/24 | 256 | RIPE NCC | RU | 22nd Oct 2021 |
| 176.97.201.0/24 | 256 | RIPE NCC |  CZ | 22nd Oct 2021 |
| 176.97.202.0/24 | 256 | RIPE NCC |  BE | 22nd Oct 2021 |
| 176.97.209.0/24 | 256 | RIPE NCC | DE | 22nd Oct 2021 |
| 176.99.32.0/20 | 4.1k | RIPE NCC |  MT | 27th Jun 2012 |
| 177.105.96.0/20 | 4.1k | LACNIC |  BR | 11th Nov 2011 |
| 177.11.88.0/22 | 1k | LACNIC | BR | 28th Dec 2010 |
| 177.122.0.0/16 | 65.5k | RIPE NCC |  VG | 17th Aug 2012 |
| 177.125.0.0/21 | 2k | LACNIC | BR | 22nd Dec 2011 |
| 177.125.181.0/24 | 256 | LACNIC | BR | 24th Mar 2023 |
| 177.125.183.0/24 | 256 | LACNIC | BR | 7th Mar 2012 |
| 177.126.12.0/24 | 256 | LACNIC | BR | 2nd Jan 2012 |
| 177.128.132.0/22 | 1k | LACNIC | BR | 3rd May 2013 |
| 177.136.48.0/20 | 4.1k | LACNIC | BR | 31st Jan 2012 |
| 177.154.16.0/22 | 1k | LACNIC | BR | 18th Jun 2013 |
| 177.154.94.0/24 | 256 | LACNIC | BR | 26th Jul 2013 |
| 177.166.0.0/16 | 65.5k | RIPE NCC | VG | 1st Jun 2012 |
| 177.176.0.0/16 | 65.5k | ARIN |  US | 29th Jul 2026 |
| 177.178.0.0/15 | 131k | ARIN | US | 29th Jul 2026 |
| 177.2.192.0/18 | 16.4k | LACNIC | BR | 4th Nov 2010 |
| 177.200.234.0/23 | 512 | LACNIC |  AR | 30th Jun 2020 |
| 177.201.160.0/19 | 8.2k | RIPE NCC |  CN | 6th Mar 2025 |
| 177.201.192.0/19 | 8.2k | RIPE NCC |  AE | 6th Mar 2025 |
| 177.202.240.0/20 | 4.1k | RIPE NCC |  LT | 13th Mar 2025 |
| 177.203.224.0/19 | 8.2k | RIPE NCC | CN | 6th Mar 2025 |
| 177.203.80.0/20 | 4.1k | APNIC |  IN | 13th Mar 2025 |
| 177.203.96.0/19 | 8.2k | RIPE NCC | CN | 6th Mar 2025 |
| 177.208.0.0/16 | 65.5k | ARIN | US | 29th Jul 2026 |
| 177.209.0.0/16 | 65.5k | ARIN | US | 29th Jul 2026 |
| 177.21.144.0/22 | 1k | LACNIC |  MX | 24th Feb 2025 |
| 177.21.152.0/23 | 512 | LACNIC | BR | 5th May 2025 |
| 177.21.154.0/23 | 512 | LACNIC |  PA | 16th Jun 2025 |
| 177.234.0.0/17 | 32.8k | LACNIC | MX | 13th Sept 2013 |
| 177.3.128.0/20 | 4.1k | LACNIC | BR | 4th Nov 2010 |
| 177.3.144.0/20 | 4.1k | RIPE NCC | LT | 13th Mar 2025 |
| 177.36.28.0/22 | 1k | LACNIC |  CL | 21st Jan 2026 |