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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,256 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 199.104.96.0/21 | 2k | ARIN |  US | 10th Jan 1994 |
| 199.114.0.0/23 | 512 | ARIN | US | 14th Mar 1994 |
| 199.114.12.0/24 | 256 | ARIN | US | 22nd Feb 1994 |
| 199.114.13.0/24 | 256 | ARIN | US | 26th Feb 2021 |
| 199.114.2.0/23 | 512 | ARIN | US | 25th Jan 1994 |
| 199.114.212.0/22 | 1k | ARIN | US | 23rd Feb 2012 |
| 199.114.224.0/22 | 1k | ARIN | US | 24th Feb 2012 |
| 199.114.4.0/23 | 512 | ARIN | US | 25th Jan 1994 |
| 199.114.6.0/24 | 256 | ARIN | US | 25th Jan 1994 |
| 199.114.8.0/22 | 1k | ARIN | US | 22nd Feb 1994 |
| 199.115.106.0/23 | 512 | ARIN | US | 2nd Mar 2012 |
| 199.115.108.0/24 | 256 | ARIN | US | 2nd Mar 2012 |
| 199.115.109.0/24 | 256 | ARIN | US | 2nd Mar 2012 |
| 199.115.159.0/24 | 256 | ARIN | US | 19th Sept 2012 |
| 199.115.160.0/22 | 1k | ARIN | US | 20th Apr 2011 |
| 199.115.174.0/24 | 256 | ARIN | US | 6th May 2026 |
| 199.115.175.0/24 | 256 | RIPE NCC |  IL | 20th Apr 2011 |
| 199.115.31.0/24 | 256 | ARIN | US | 7th Apr 2016 |
| 199.115.48.0/22 | 1k | ARIN | US | 22nd Feb 1994 |
| 199.115.52.0/23 | 512 | ARIN | US | 22nd Feb 1994 |
| 199.115.84.0/22 | 1k | ARIN | US | 1st Mar 2012 |
| 199.116.0.0/22 | 1k | ARIN | US | 24th Jul 1996 |
| 199.116.16.0/20 | 4.1k | ARIN | US | 13th Jan 1994 |
| 199.116.32.0/20 | 4.1k | ARIN | US | 9th Feb 1994 |
| 199.116.4.0/23 | 512 | ARIN | US | 24th Jul 1996 |
| 199.116.48.0/22 | 1k | ARIN | US | 9th Feb 1994 |
| 199.116.64.0/21 | 2k | ARIN | US | 5th Mar 2012 |
| 199.116.84.0/22 | 1k | ARIN | US | 7th Mar 2012 |
| 199.119.16.0/21 | 2k | ARIN | US | 22nd Jan 1994 |
| 199.119.184.0/21 | 2k | ARIN | US | 12th May 2011 |
| 199.119.32.0/19 | 8.2k | ARIN | US | 22nd Jan 1994 |
| 199.120.0.0/21 | 2k | ARIN | US | 24th Jan 1994 |
| 199.120.130.0/24 | 256 | ARIN | US | 1st Mar 1994 |
| 199.120.132.0/22 | 1k | ARIN | US | 1st Mar 1994 |
| 199.120.136.0/23 | 512 | ARIN | US | 1st Mar 1994 |
| 199.120.138.0/24 | 256 | ARIN | US | 1st Mar 1994 |
| 199.120.139.0/24 | 256 | ARIN | US | 1st Mar 1994 |
| 199.120.140.0/24 | 256 | ARIN | US | 3rd Mar 1994 |
| 199.120.145.0/24 | 256 | ARIN | US | 3rd Mar 1994 |
| 199.120.146.0/23 | 512 | ARIN | US | 3rd Mar 1994 |
| 199.120.155.0/24 | 256 | ARIN | US | 3rd Mar 1994 |
| 199.120.156.0/24 | 256 | ARIN | US | 3rd Mar 1994 |
| 199.120.159.0/24 | 256 | ARIN | US | 3rd Mar 1994 |
| 199.120.160.0/24 | 256 | ARIN | US | 3rd Mar 1994 |
| 199.120.161.0/24 | 256 | ARIN | US | 3rd Mar 1994 |
| 199.120.162.0/24 | 256 | ARIN | US | 3rd Mar 1994 |
| 199.120.163.0/24 | 256 | ARIN | US | 3rd Mar 1994 |
| 199.120.164.0/24 | 256 | ARIN | US | 3rd Mar 1994 |
| 199.120.165.0/24 | 256 | ARIN | US | 3rd Mar 1994 |
| 199.120.168.0/24 | 256 | ARIN | US | 3rd Mar 1994 |