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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 185.153.88.0/22 | 1k | RIPE NCC |  DE | 23rd May 2016 |
| 185.154.104.0/22 | 1k | RIPE NCC | DE | 31st May 2016 |
| 185.154.120.0/22 | 1k | RIPE NCC |  RU | 31st May 2016 |
| 185.154.140.0/22 | 1k | RIPE NCC |  BE | 31st May 2016 |
| 185.154.172.0/22 | 1k | RIPE NCC |  FR | 2nd Jun 2016 |
| 185.154.176.0/22 | 1k | RIPE NCC |  DK | 2nd Jun 2016 |
| 185.154.190.0/24 | 256 | RIPE NCC |  IR | 12th Jan 2024 |
| 185.154.191.0/24 | 256 | RIPE NCC |  HR | 12th Jan 2024 |
| 185.154.244.0/22 | 1k | RIPE NCC |  US | 6th Jun 2016 |
| 185.154.28.0/22 | 1k | RIPE NCC | DE | 27th May 2016 |
| 185.155.117.0/24 | 256 | RIPE NCC |  AT | 27th Jan 2026 |
| 185.155.229.0/24 | 256 | RIPE NCC | IR | 11th Aug 2025 |
| 185.155.230.0/24 | 256 | RIPE NCC |  ES | 11th Aug 2025 |
| 185.155.244.0/22 | 1k | RIPE NCC |  GB | 14th Jun 2016 |
| 185.155.44.0/22 | 1k | RIPE NCC |  NL | 7th Jun 2016 |
| 185.156.144.0/22 | 1k | RIPE NCC | AT | 17th Jun 2016 |
| 185.156.164.0/22 | 1k | RIPE NCC | GB | 17th Jun 2016 |
| 185.156.168.0/22 | 1k | RIPE NCC | BE | 17th Jun 2016 |
| 185.156.180.0/22 | 1k | RIPE NCC | RU | 20th Jun 2016 |
| 185.156.48.0/24 | 256 | RIPE NCC |  CY | 1st Jun 2026 |
| 185.156.50.0/24 | 256 | RIPE NCC | FR | 16th Jun 2026 |
| 185.156.88.0/22 | 1k | RIPE NCC | ES | 15th Jun 2016 |
| 185.156.92.0/22 | 1k | RIPE NCC | ES | 15th Jun 2016 |
| 185.157.104.0/22 | 1k | RIPE NCC |  RS | 27th Jun 2016 |
| 185.157.122.0/24 | 256 | RIPE NCC |  CH | 1st Apr 2020 |
| 185.157.123.0/24 | 256 | RIPE NCC | AT | 25th Jan 2022 |
| 185.157.218.0/23 | 512 | RIPE NCC |  TR | 30th Jun 2016 |
| 185.158.244.0/22 | 1k | RIPE NCC | US | 8th Jul 2016 |
| 185.158.32.0/22 | 1k | RIPE NCC |  SY | 1st Jul 2016 |
| 185.158.68.0/22 | 1k | RIPE NCC |  RO | 7th Jan 2019 |
| 185.158.76.0/22 | 1k | RIPE NCC | GB | 4th Jul 2016 |
| 185.158.88.0/22 | 1k | RIPE NCC |  IT | 4th Jul 2016 |
| 185.159.124.0/23 | 512 | RIPE NCC | NL | 14th Jul 2016 |
| 185.159.126.0/24 | 256 | RIPE NCC | NL | 14th Jul 2016 |
| 185.159.132.0/22 | 1k | RIPE NCC |  CZ | 14th Jul 2016 |
| 185.159.148.0/22 | 1k | RIPE NCC | RU | 14th Jul 2016 |
| 185.159.180.0/22 | 1k | RIPE NCC |  JO | 15th Jul 2016 |
| 185.159.188.0/24 | 256 | RIPE NCC |  PL | 18th Jan 2023 |
| 185.159.189.0/24 | 256 | RIPE NCC | IR | 18th Jan 2023 |
| 185.159.24.0/22 | 1k | RIPE NCC |  EE | 11th Jul 2016 |
| 185.159.245.0/24 | 256 | RIPE NCC | DE | 22nd Nov 2023 |
| 185.159.86.0/24 | 256 | RIPE NCC | DE | 23rd Jun 2021 |
| 185.159.89.0/24 | 256 | ARIN | US | 13th Oct 2025 |
| 185.16.128.0/22 | 1k | RIPE NCC | PL | 22nd Jan 2013 |
| 185.16.24.0/24 | 256 | RIPE NCC |  AE | 17th Jan 2013 |
| 185.16.249.0/24 | 256 | RIPE NCC |  LB | 12th Feb 2020 |
| 185.16.251.0/24 | 256 | RIPE NCC | RO | 20th Mar 2023 |
| 185.160.156.0/22 | 1k | RIPE NCC | NL | 22nd Jul 2016 |
| 185.160.172.0/22 | 1k | RIPE NCC | DE | 30th Jan 2019 |
| 185.160.200.0/22 | 1k | RIPE NCC | DE | 25th Jul 2016 |