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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 198.99.217.0/24 | 256 | ARIN |  US | 27th Apr 1993 |
| 198.99.218.0/24 | 256 | ARIN |  CA | 27th Apr 1993 |
| 198.99.219.0/24 | 256 | ARIN | CA | 27th Apr 1993 |
| 198.99.220.0/24 | 256 | ARIN | CA | 27th Apr 1993 |
| 198.99.221.0/24 | 256 | ARIN | CA | 27th Apr 1993 |
| 198.99.222.0/24 | 256 | RIPE NCC |  CH | 1st Sept 1993 |
| 198.99.223.0/24 | 256 | ARIN | US | 29th Apr 1993 |
| 198.99.229.0/24 | 256 | ARIN | US | 29th Apr 1993 |
| 198.99.232.0/23 | 512 | ARIN | US | 29th Apr 1993 |
| 198.99.234.0/24 | 256 | ARIN | US | 29th Apr 1993 |
| 198.99.235.0/24 | 256 | ARIN | US | 29th Apr 1993 |
| 198.99.236.0/24 | 256 | ARIN | US | 29th Apr 1993 |
| 198.99.239.0/24 | 256 | ARIN | US | 29th Apr 1993 |
| 198.99.240.0/24 | 256 | ARIN | US | 29th Apr 1993 |
| 198.99.242.0/24 | 256 | ARIN | US | 29th Apr 1993 |
| 198.99.243.0/24 | 256 | ARIN | US | 29th Apr 1993 |
| 198.99.245.0/24 | 256 | ARIN | US | 3rd May 1993 |
| 198.99.26.0/23 | 512 | ARIN | US | 12th Mar 2014 |
| 198.99.4.0/24 | 256 | ARIN | US | 17th Mar 1993 |
| 198.99.5.0/24 | 256 | ARIN | US | 17th Mar 1993 |
| 198.99.6.0/24 | 256 | ARIN | US | 17th Mar 1993 |
| 198.99.64.0/24 | 256 | ARIN | US | 22nd Mar 1993 |
| 198.99.66.0/24 | 256 | ARIN | US | 22nd Mar 1993 |
| 198.99.69.0/24 | 256 | ARIN | US | 23rd Mar 1993 |
| 198.99.7.0/24 | 256 | ARIN | US | 17th Mar 1993 |
| 198.99.70.0/23 | 512 | ARIN | US | 23rd Mar 1993 |
| 198.99.72.0/24 | 256 | ARIN | US | 23rd Mar 1993 |
| 198.99.73.0/24 | 256 | ARIN | US | 26th Mar 1993 |
| 198.99.74.0/24 | 256 | ARIN | US | 2nd Jul 2026 |
| 198.99.77.0/24 | 256 | ARIN | US | 26th Mar 1993 |
| 198.99.78.0/24 | 256 | ARIN | US | 26th Mar 1993 |
| 198.99.79.0/24 | 256 | ARIN | US | 26th Mar 1993 |
| 198.99.85.0/24 | 256 | ARIN | US | 27th Mar 1993 |
| 198.99.86.0/24 | 256 | ARIN | US | 27th Mar 1993 |
| 198.99.87.0/24 | 256 | ARIN | US | 27th Mar 1993 |
| 198.99.93.0/24 | 256 | ARIN | US | 30th Mar 1993 |
| 198.99.94.0/24 | 256 | ARIN | US | 31st Mar 1993 |
| 198.99.95.0/24 | 256 | ARIN | US | 31st Mar 1993 |
| 198.99.97.0/24 | 256 | ARIN | US | 31st Mar 1993 |
| 198.99.98.0/24 | 256 | ARIN | US | 31st Mar 1993 |
| 198.99.99.0/24 | 256 | ARIN | US | 31st Mar 1993 |
| 199.10.106.0/24 | 256 | ARIN | US | 30th Nov 1993 |
| 199.10.112.0/24 | 256 | ARIN | US | 3rd Dec 1993 |
| 199.10.113.0/24 | 256 | ARIN | US | 3rd Dec 1993 |
| 199.10.120.0/24 | 256 | ARIN | US | 30th Nov 1993 |
| 199.10.121.0/24 | 256 | ARIN | US | 1st Jan 1990 |
| 199.10.122.0/24 | 256 | ARIN | US | 1st Jan 1990 |
| 199.10.125.0/24 | 256 | ARIN | US | 25th Jan 1994 |
| 199.10.126.0/24 | 256 | ARIN | US | 3rd Jan 1994 |
| 199.10.136.0/24 | 256 | ARIN | US | 12th Jan 1994 |