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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 198.49.237.0/24 | 256 | ARIN |  US | 8th Mar 1993 |
| 198.49.238.0/24 | 256 | ARIN | US | 8th Mar 1993 |
| 198.49.239.0/24 | 256 | ARIN | US | 8th Mar 1993 |
| 198.49.24.0/24 | 256 | ARIN | US | 28th Jan 1993 |
| 198.49.240.0/24 | 256 | ARIN | US | 8th Mar 1993 |
| 198.49.241.0/24 | 256 | ARIN | US | 8th Mar 1993 |
| 198.49.242.0/24 | 256 | ARIN | US | 8th Mar 1993 |
| 198.49.245.0/24 | 256 | ARIN | US | 8th Mar 1993 |
| 198.49.246.0/24 | 256 | ARIN | US | 8th Mar 1993 |
| 198.49.248.0/24 | 256 | ARIN | US | 10th Mar 1993 |
| 198.49.25.0/24 | 256 | ARIN | US | 28th Jan 1993 |
| 198.49.252.0/24 | 256 | ARIN | US | 10th Mar 1993 |
| 198.49.255.0/24 | 256 | ARIN | US | 5th Sept 2013 |
| 198.49.26.0/24 | 256 | ARIN | US | 28th Jan 1993 |
| 198.49.3.0/24 | 256 | APNIC |  NZ | 3rd Feb 2011 |
| 198.49.40.0/24 | 256 | ARIN | US | 29th Jan 1993 |
| 198.49.42.0/24 | 256 | ARIN | US | 29th Jan 1993 |
| 198.49.5.0/24 | 256 | ARIN | US | 27th Jan 1993 |
| 198.49.7.0/24 | 256 | ARIN | US | 27th Jan 1993 |
| 198.49.83.0/24 | 256 | ARIN | US | 4th Feb 1993 |
| 198.49.84.0/24 | 256 | ARIN | US | 4th Feb 1993 |
| 198.49.85.0/24 | 256 | ARIN | US | 5th Feb 1993 |
| 198.49.87.0/24 | 256 | APNIC |  AU | 10th Jan 2011 |
| 198.49.90.0/24 | 256 | ARIN | US | 22nd Aug 2013 |
| 198.49.91.0/24 | 256 | ARIN | US | 5th Feb 1993 |
| 198.49.97.0/24 | 256 | ARIN | US | 8th Feb 1993 |
| 198.49.98.0/24 | 256 | ARIN | US | 8th Feb 1993 |
| 198.49.99.0/24 | 256 | ARIN | US | 26th Aug 2013 |
| 198.51.1.0/24 | 256 | ARIN | US | 22nd Jan 1993 |
| 198.51.10.0/24 | 256 | ARIN | US | 25th Jan 1993 |
| 198.51.101.0/24 | 256 | APNIC |  ID | 14th Feb 2011 |
| 198.51.104.0/22 | 1k | ARIN |  CA | 10th Sept 2012 |
| 198.51.108.0/24 | 256 | ARIN | US | 1st Feb 1993 |
| 198.51.109.0/24 | 256 | ARIN | US | 1st Feb 1993 |
| 198.51.110.0/24 | 256 | ARIN | US | 1st Feb 1993 |
| 198.51.112.0/22 | 1k | ARIN | CA | 1st Feb 1993 |
| 198.51.116.0/23 | 512 | ARIN | CA | 1st Feb 1993 |
| 198.51.12.0/24 | 256 | RIPE NCC |  SA | 25th Jan 1993 |
| 198.51.120.0/24 | 256 | ARIN | US | 1st Feb 1993 |
| 198.51.122.0/24 | 256 | ARIN | US | 1st Feb 1993 |
| 198.51.123.0/24 | 256 | ARIN | US | 1st Feb 1993 |
| 198.51.124.0/24 | 256 | ARIN | US | 1st Feb 1993 |
| 198.51.129.0/24 | 256 | ARIN | US | 2nd Feb 1993 |
| 198.51.132.0/22 | 1k | ARIN | US | 25th Feb 2013 |
| 198.51.141.0/24 | 256 | ARIN | US | 2nd Feb 1993 |
| 198.51.142.0/24 | 256 | ARIN | US | 2nd Feb 1993 |
| 198.51.143.0/24 | 256 | RIPE NCC |  SY | 2nd Feb 1993 |
| 198.51.144.0/23 | 512 | RIPE NCC | SY | 2nd Feb 1993 |
| 198.51.146.0/24 | 256 | RIPE NCC | SY | 2nd Feb 1993 |
| 198.51.147.0/24 | 256 | ARIN | US | 2nd Feb 1993 |