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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 198.73.185.0/24 | 256 | ARIN |  CA | 10th May 1993 |
| 198.73.187.0/24 | 256 | ARIN | CA | 12th May 1993 |
| 198.73.188.0/24 | 256 | ARIN | CA | 12th May 1993 |
| 198.73.189.0/24 | 256 | ARIN | CA | 13th May 1993 |
| 198.73.191.0/24 | 256 | ARIN | CA | 17th May 1993 |
| 198.73.209.0/24 | 256 | ARIN |  US | 21st Nov 2013 |
| 198.73.211.0/24 | 256 | ARIN | CA | 19th Feb 1993 |
| 198.73.216.0/23 | 512 | ARIN | CA | 16th Feb 1993 |
| 198.73.219.0/24 | 256 | ARIN | CA | 18th May 1993 |
| 198.73.221.0/24 | 256 | ARIN | CA | 2nd Apr 2026 |
| 198.73.228.0/24 | 256 | ARIN | US | 18th May 1993 |
| 198.73.229.0/24 | 256 | ARIN | US | 18th May 1993 |
| 198.73.230.0/24 | 256 | ARIN | US | 18th May 1993 |
| 198.73.231.0/24 | 256 | ARIN | US | 18th May 1993 |
| 198.73.232.0/24 | 256 | ARIN | US | 18th May 1993 |
| 198.73.233.0/24 | 256 | ARIN | US | 18th May 1993 |
| 198.73.234.0/24 | 256 | ARIN | US | 18th May 1993 |
| 198.73.235.0/24 | 256 | ARIN | US | 18th May 1993 |
| 198.73.236.0/24 | 256 | ARIN | US | 18th May 1993 |
| 198.73.237.0/24 | 256 | ARIN | US | 18th May 1993 |
| 198.73.238.0/24 | 256 | ARIN | US | 18th May 1993 |
| 198.73.239.0/24 | 256 | ARIN | US | 18th May 1993 |
| 198.73.246.0/24 | 256 | ARIN | US | 14th Jun 1993 |
| 198.73.251.0/24 | 256 | ARIN | CA | 14th Jun 1993 |
| 198.73.252.0/24 | 256 | ARIN | CA | 22nd Jun 1993 |
| 198.73.253.0/24 | 256 | ARIN | US | 24th Jun 1993 |
| 198.73.31.0/24 | 256 | ARIN | CA | 28th Apr 1993 |
| 198.73.32.0/24 | 256 | ARIN | US | 19th Nov 2013 |
| 198.73.33.0/24 | 256 | ARIN | CA | 27th Apr 1993 |
| 198.73.34.0/24 | 256 | ARIN | CA | 27th Apr 1993 |
| 198.73.35.0/24 | 256 | ARIN | CA | 27th Apr 1993 |
| 198.73.36.0/24 | 256 | ARIN | CA | 27th Apr 1993 |
| 198.73.37.0/24 | 256 | ARIN | CA | 27th Apr 1993 |
| 198.73.38.0/24 | 256 | ARIN | US | 27th Apr 1993 |
| 198.73.39.0/24 | 256 | ARIN | CA | 27th Apr 1993 |
| 198.73.40.0/24 | 256 | ARIN | CA | 27th Apr 1993 |
| 198.73.41.0/24 | 256 | ARIN | CA | 27th Apr 1993 |
| 198.73.42.0/24 | 256 | ARIN | CA | 27th Apr 1993 |
| 198.73.43.0/24 | 256 | ARIN | CA | 27th Apr 1993 |
| 198.73.44.0/24 | 256 | ARIN | CA | 27th Apr 1993 |
| 198.73.45.0/24 | 256 | ARIN | CA | 27th Apr 1993 |
| 198.73.46.0/24 | 256 | ARIN | CA | 27th Apr 1993 |
| 198.73.47.0/24 | 256 | ARIN | CA | 27th Apr 1993 |
| 198.73.48.0/24 | 256 | ARIN | CA | 27th Apr 1993 |
| 198.73.49.0/24 | 256 | ARIN | CA | 27th Apr 1993 |
| 198.73.5.0/24 | 256 | ARIN | US | 27th Dec 2016 |
| 198.73.52.0/24 | 256 | ARIN | CA | 27th Apr 1993 |
| 198.73.54.0/24 | 256 | ARIN | CA | 15th Aug 2023 |
| 198.73.83.0/24 | 256 | ARIN | CA | 7th Apr 1993 |
| 198.73.84.0/24 | 256 | ARIN | CA | 7th Apr 1993 |