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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 198.71.28.0/22 | 1k | ARIN |  US | 11th Sept 2012 |
| 198.71.40.0/22 | 1k | ARIN | US | 12th Feb 1993 |
| 198.71.64.0/21 | 2k | ARIN | US | 12th Feb 1993 |
| 198.71.72.0/22 | 1k | ARIN | US | 12th Feb 1993 |
| 198.71.8.0/21 | 2k | ARIN | US | 24th Feb 1993 |
| 198.72.16.0/21 | 2k | ARIN | US | 5th Mar 1993 |
| 198.72.32.0/21 | 2k | ARIN | US | 8th Mar 1993 |
| 198.72.4.0/23 | 512 | ARIN | US | 19th Feb 1993 |
| 198.72.40.0/23 | 512 | ARIN | US | 8th Mar 1993 |
| 198.73.105.0/24 | 256 | ARIN | US | 12th Apr 1993 |
| 198.73.106.0/23 | 512 | ARIN | US | 12th Apr 1993 |
| 198.73.108.0/24 | 256 | ARIN | US | 12th Apr 1993 |
| 198.73.109.0/24 | 256 | ARIN |  CA | 14th Apr 1993 |
| 198.73.116.0/23 | 512 | ARIN | CA | 14th Apr 1993 |
| 198.73.120.0/24 | 256 | ARIN | CA | 19th Apr 1993 |
| 198.73.121.0/24 | 256 | ARIN | CA | 19th Apr 1993 |
| 198.73.122.0/24 | 256 | ARIN | CA | 22nd Apr 1993 |
| 198.73.132.0/24 | 256 | ARIN | CA | 28th Apr 1993 |
| 198.73.137.0/24 | 256 | ARIN | CA | 28th Apr 1993 |
| 198.73.138.0/23 | 512 | ARIN | CA | 28th Apr 1993 |
| 198.73.140.0/22 | 1k | ARIN | CA | 20th Jul 1993 |
| 198.73.144.0/22 | 1k | ARIN | CA | 20th Jul 1993 |
| 198.73.150.0/24 | 256 | ARIN | CA | 27th Apr 1993 |
| 198.73.151.0/24 | 256 | ARIN | CA | 27th Apr 1993 |
| 198.73.153.0/24 | 256 | ARIN | CA | 27th Apr 1993 |
| 198.73.154.0/24 | 256 | ARIN | CA | 27th Apr 1993 |
| 198.73.155.0/24 | 256 | ARIN | CA | 27th Apr 1993 |
| 198.73.156.0/24 | 256 | ARIN | CA | 27th Apr 1993 |
| 198.73.157.0/24 | 256 | ARIN | CA | 27th Apr 1993 |
| 198.73.158.0/24 | 256 | ARIN | US | 27th Apr 1993 |
| 198.73.159.0/24 | 256 | ARIN | US | 27th Apr 1993 |
| 198.73.160.0/24 | 256 | ARIN | US | 27th Apr 1993 |
| 198.73.161.0/24 | 256 | ARIN | CA | 28th Apr 1993 |
| 198.73.162.0/24 | 256 | ARIN | CA | 28th Apr 1993 |
| 198.73.163.0/24 | 256 | ARIN | CA | 28th Apr 1993 |
| 198.73.165.0/24 | 256 | ARIN | CA | 29th Apr 1993 |
| 198.73.166.0/24 | 256 | ARIN | CA | 29th Apr 1993 |
| 198.73.167.0/24 | 256 | ARIN | CA | 29th Apr 1993 |
| 198.73.168.0/24 | 256 | ARIN | CA | 29th Apr 1993 |
| 198.73.169.0/24 | 256 | ARIN | CA | 29th Apr 1993 |
| 198.73.170.0/24 | 256 | ARIN | CA | 29th Apr 1993 |
| 198.73.171.0/24 | 256 | ARIN | CA | 23rd Nov 1993 |
| 198.73.172.0/24 | 256 | ARIN | US | 30th Apr 1993 |
| 198.73.173.0/24 | 256 | ARIN | US | 30th Apr 1993 |
| 198.73.174.0/24 | 256 | ARIN | US | 30th Apr 1993 |
| 198.73.175.0/24 | 256 | ARIN | US | 30th Apr 1993 |
| 198.73.177.0/24 | 256 | ARIN | CA | 24th Jun 1993 |
| 198.73.179.0/24 | 256 | ARIN | CA | 6th May 1993 |
| 198.73.182.0/24 | 256 | ARIN | CA | 10th May 1993 |
| 198.73.184.0/24 | 256 | ARIN | US | 10th May 1993 |