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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,244 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 198.101.6.0/24 | 256 | ARIN |  US | 24th Mar 1993 |
| 198.102.0.0/24 | 256 | ARIN | US | 18th Mar 1993 |
| 198.102.100.0/24 | 256 | ARIN | US | 29th Mar 1993 |
| 198.102.101.0/24 | 256 | ARIN | US | 29th Mar 1993 |
| 198.102.102.0/24 | 256 | ARIN | US | 29th Mar 1993 |
| 198.102.105.0/24 | 256 | ARIN | US | 2nd Jul 2026 |
| 198.102.107.0/24 | 256 | ARIN | US | 2nd Jul 2026 |
| 198.102.108.0/24 | 256 | ARIN | US | 2nd Jul 2026 |
| 198.102.112.0/23 | 512 | ARIN | US | 25th Mar 1993 |
| 198.102.114.0/24 | 256 | ARIN | US | 25th Mar 1993 |
| 198.102.115.0/24 | 256 | ARIN | US | 25th Mar 1993 |
| 198.102.116.0/23 | 512 | ARIN | US | 25th Mar 1993 |
| 198.102.118.0/23 | 512 | ARIN | US | 25th Mar 1993 |
| 198.102.120.0/24 | 256 | ARIN | US | 25th Mar 1993 |
| 198.102.121.0/24 | 256 | ARIN | US | 25th Mar 1993 |
| 198.102.122.0/23 | 512 | ARIN | US | 25th Mar 1993 |
| 198.102.124.0/23 | 512 | ARIN | US | 25th Mar 1993 |
| 198.102.126.0/24 | 256 | ARIN | US | 25th Mar 1993 |
| 198.102.144.0/23 | 512 | ARIN | US | 26th Mar 1993 |
| 198.102.146.0/24 | 256 | ARIN | US | 26th Mar 1993 |
| 198.102.148.0/24 | 256 | ARIN | US | 27th Mar 1993 |
| 198.102.149.0/24 | 256 | ARIN | US | 27th Mar 1993 |
| 198.102.156.0/24 | 256 | ARIN | US | 27th Mar 1993 |
| 198.102.157.0/24 | 256 | ARIN | US | 27th Mar 1993 |
| 198.102.160.0/24 | 256 | ARIN | US | 27th Mar 1993 |
| 198.102.163.0/24 | 256 | ARIN | US | 27th Mar 1993 |
| 198.102.164.0/22 | 1k | ARIN | US | 27th Mar 1993 |
| 198.102.168.0/23 | 512 | ARIN | US | 27th Mar 1993 |
| 198.102.170.0/24 | 256 | ARIN | US | 27th Mar 1993 |
| 198.102.171.0/24 | 256 | ARIN | US | 29th Mar 1993 |
| 198.102.173.0/24 | 256 | ARIN | US | 29th Mar 1993 |
| 198.102.174.0/24 | 256 | ARIN |  CA | 29th Mar 1993 |
| 198.102.175.0/24 | 256 | ARIN | US | 29th Mar 1993 |
| 198.102.184.0/23 | 512 | ARIN | US | 29th Mar 1993 |
| 198.102.200.0/24 | 256 | ARIN | US | 31st Mar 1993 |
| 198.102.201.0/24 | 256 | ARIN | US | 31st Mar 1993 |
| 198.102.202.0/24 | 256 | ARIN | US | 31st Mar 1993 |
| 198.102.203.0/24 | 256 | ARIN | US | 31st Mar 1993 |
| 198.102.204.0/24 | 256 | ARIN | US | 31st Mar 1993 |
| 198.102.205.0/24 | 256 | ARIN | US | 31st Mar 1993 |
| 198.102.207.0/24 | 256 | ARIN | US | 31st Mar 1993 |
| 198.102.208.0/24 | 256 | ARIN | US | 31st Mar 1993 |
| 198.102.209.0/24 | 256 | ARIN | US | 31st Mar 1993 |
| 198.102.210.0/24 | 256 | ARIN | US | 31st Mar 1993 |
| 198.102.214.0/24 | 256 | ARIN | US | 1st Apr 1993 |
| 198.102.215.0/24 | 256 | ARIN | US | 1st Apr 1993 |
| 198.102.216.0/24 | 256 | ARIN | US | 1st Apr 1993 |
| 198.102.217.0/24 | 256 | ARIN | US | 1st Apr 1993 |
| 198.102.220.0/24 | 256 | ARIN | US | 2nd Apr 1993 |
| 198.102.222.0/24 | 256 | ARIN | US | 2nd Apr 1993 |