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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,310 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 199.5.208.0/23 | 512 | ARIN |  US | 22nd Dec 1993 |
| 199.5.212.0/24 | 256 | ARIN | US | 22nd Dec 1993 |
| 199.5.213.0/24 | 256 | ARIN | US | 22nd Dec 1993 |
| 199.5.214.0/23 | 512 | ARIN | US | 22nd Dec 1993 |
| 199.5.216.0/23 | 512 | ARIN | US | 22nd Dec 1993 |
| 199.5.218.0/24 | 256 | ARIN | US | 22nd Dec 1993 |
| 199.5.219.0/24 | 256 | ARIN | US | 22nd Dec 1993 |
| 199.5.222.0/24 | 256 | ARIN | US | 27th Dec 1993 |
| 199.5.224.0/24 | 256 | ARIN | US | 27th Dec 1993 |
| 199.5.225.0/24 | 256 | ARIN | US | 27th Dec 1993 |
| 199.5.226.0/23 | 512 | ARIN | US | 27th Dec 1993 |
| 199.5.228.0/24 | 256 | ARIN | US | 24th Feb 1997 |
| 199.5.229.0/24 | 256 | ARIN | US | 27th Dec 1993 |
| 199.5.230.0/24 | 256 | ARIN | US | 27th Dec 1993 |
| 199.5.234.0/23 | 512 | ARIN | US | 27th Dec 1993 |
| 199.5.236.0/23 | 512 | ARIN | US | 27th Dec 1993 |
| 199.5.238.0/24 | 256 | ARIN | US | 27th Dec 1993 |
| 199.5.239.0/24 | 256 | ARIN | US | 27th Dec 1993 |
| 199.5.24.0/23 | 512 | ARIN | US | 13th Sept 1993 |
| 199.5.240.0/24 | 256 | ARIN | US | 27th Dec 1993 |
| 199.5.241.0/24 | 256 | ARIN | US | 27th Dec 1993 |
| 199.5.243.0/24 | 256 | ARIN | US | 27th Dec 1993 |
| 199.5.244.0/23 | 512 | ARIN | US | 27th Dec 1993 |
| 199.5.246.0/24 | 256 | ARIN | US | 27th Dec 1993 |
| 199.5.249.0/24 | 256 | ARIN | US | 27th Dec 1993 |
| 199.5.250.0/23 | 512 | ARIN | US | 27th Dec 1993 |
| 199.5.254.0/24 | 256 | ARIN | US | 27th Dec 1993 |
| 199.51.0.0/16 | 65.5k | ARIN | US | 8th Nov 1993 |
| 199.58.12.0/24 | 256 | ARIN | US | 10th Feb 1994 |
| 199.58.140.0/22 | 1k | ARIN | US | 9th Nov 2010 |
| 199.58.156.0/22 | 1k | ARIN | US | 15th Nov 2010 |
| 199.58.16.0/21 | 2k | ARIN | US | 18th Nov 1993 |
| 199.58.24.0/22 | 1k | ARIN | US | 18th Nov 1993 |
| 199.58.240.0/21 | 2k | ARIN | US | 22nd Nov 2010 |
| 199.58.254.0/24 | 256 | ARIN | US | 19th Jul 2016 |
| 199.58.8.0/22 | 1k | ARIN | US | 10th Feb 1994 |
| 199.59.16.0/21 | 2k | ARIN | US | 18th Nov 1993 |
| 199.59.160.0/21 | 2k | ARIN | US | 29th Nov 2010 |
| 199.59.28.0/23 | 512 | ARIN | US | 18th Nov 1993 |
| 199.59.30.0/24 | 256 | ARIN | US | 18th Nov 1993 |
| 199.59.48.0/22 | 1k | ARIN | US | 14th Dec 2011 |
| 199.59.8.0/21 | 2k | ARIN | US | 1st Dec 1993 |
| 199.60.117.0/24 | 256 | ARIN |  CA | 23rd Nov 1993 |
| 199.60.121.0/24 | 256 | ARIN | CA | 23rd Nov 1993 |
| 199.60.122.0/24 | 256 | ARIN | CA | 23rd Nov 1994 |
| 199.60.123.0/24 | 256 | ARIN | US | 23rd Nov 1994 |
| 199.60.128.0/20 | 4.1k | ARIN | CA | 3rd Mar 1994 |
| 199.60.152.0/22 | 1k | ARIN | CA | 29th Mar 1994 |
| 199.60.156.0/23 | 512 | ARIN | CA | 4th Apr 1994 |
| 199.60.158.0/24 | 256 | ARIN | CA | 4th Apr 1994 |