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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,356 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 206.109.16.0/21 | 2k | ARIN |  US | 17th Aug 1995 |
| 206.109.160.0/19 | 8.2k | ARIN | US | 17th Aug 1995 |
| 206.109.196.0/24 | 256 | ARIN | US | 30th Mar 2026 |
| 206.109.202.0/23 | 512 | ARIN | US | 17th Aug 1995 |
| 206.109.204.0/23 | 512 | RIPE NCC |  IS | 17th Aug 1995 |
| 206.109.208.0/20 | 4.1k | ARIN | US | 15th Oct 2025 |
| 206.109.224.0/20 | 4.1k | ARIN | US | 24th Jul 2026 |
| 206.109.24.0/21 | 2k | ARIN | US | 10th Apr 2026 |
| 206.109.240.0/20 | 4.1k | ARIN | US | 26th Jun 2026 |
| 206.109.60.0/23 | 512 | ARIN | US | 17th Feb 2026 |
| 206.109.79.0/24 | 256 | ARIN |  CA | 9th Dec 2025 |
| 206.109.83.0/24 | 256 | ARIN | US | 16th Jan 2026 |
| 206.109.84.0/22 | 1k | ARIN | US | 4th Feb 2026 |
| 206.109.88.0/21 | 2k | ARIN | US | 8th Jun 2026 |
| 206.120.0.0/16 | 65.5k | ARIN | US | 1st Apr 2022 |
| 206.122.0.0/16 | 65.5k | ARIN | US | 7th Sept 1995 |
| 206.123.0.0/24 | 256 | ARIN |  GB | 10th Feb 2011 |
| 206.123.1.0/24 | 256 | ARIN | CA | 26th Oct 1995 |
| 206.123.10.0/24 | 256 | ARIN | CA | 7th Nov 1995 |
| 206.123.11.0/24 | 256 | ARIN | CA | 7th Nov 1995 |
| 206.123.12.0/24 | 256 | ARIN | CA | 14th Nov 1995 |
| 206.123.13.0/24 | 256 | ARIN | CA | 9th Nov 1995 |
| 206.123.15.0/24 | 256 | ARIN | CA | 13th Nov 1995 |
| 206.123.16.0/24 | 256 | ARIN | CA | 28th Nov 1995 |
| 206.123.19.0/24 | 256 | ARIN | CA | 8th Dec 1995 |
| 206.123.22.0/24 | 256 | ARIN | CA | 8th Dec 1995 |
| 206.123.23.0/24 | 256 | ARIN | CA | 5th Jan 1996 |
| 206.123.24.0/24 | 256 | ARIN | US | 20th Sept 2012 |
| 206.123.25.0/24 | 256 | ARIN | CA | 16th Jan 1996 |
| 206.123.30.0/24 | 256 | ARIN | GB | 13th Dec 2012 |
| 206.123.31.0/24 | 256 | ARIN | CA | 18th Jan 1996 |
| 206.123.5.0/24 | 256 | ARIN | CA | 30th Oct 1995 |
| 206.123.6.0/24 | 256 | ARIN | CA | 30th Oct 1995 |
| 206.123.7.0/24 | 256 | ARIN | US | 28th Dec 2011 |
| 206.123.8.0/24 | 256 | ARIN | CA | 17th Nov 1995 |
| 206.123.9.0/24 | 256 | ARIN | CA | 31st Oct 1995 |
| 206.124.32.0/21 | 2k | ARIN | US | 14th Sept 1995 |
| 206.124.40.0/22 | 1k | ARIN | US | 25th Feb 2020 |
| 206.124.96.0/21 | 2k | ARIN | US | 20th Sept 1995 |
| 206.125.0.0/19 | 8.2k | ARIN | US | 27th Sept 1995 |
| 206.125.164.0/22 | 1k | ARIN | CA | 18th Nov 2008 |
| 206.125.192.0/21 | 2k | ARIN | US | 3rd Oct 1995 |
| 206.125.224.0/19 | 8.2k | ARIN | US | 3rd Oct 1995 |
| 206.125.96.0/19 | 8.2k | ARIN | US | 28th Sept 1995 |
| 206.126.101.0/24 | 256 | ARIN | US | 19th Feb 1996 |
| 206.126.107.0/24 | 256 | ARIN | US | 25th Feb 1996 |
| 206.126.108.0/24 | 256 | ARIN | US | 2nd Jul 2026 |
| 206.126.113.0/24 | 256 | ARIN | US | 25th Feb 1996 |
| 206.126.114.0/23 | 512 | ARIN | US | 2nd Jul 2009 |
| 206.126.116.0/24 | 256 | ARIN | US | 8th Apr 2013 |