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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 198.73.85.0/24 | 256 | ARIN |  CA | 7th Apr 1993 |
| 198.73.86.0/24 | 256 | ARIN | CA | 7th Apr 1993 |
| 198.73.87.0/24 | 256 | ARIN | CA | 7th Apr 1993 |
| 198.73.88.0/24 | 256 | ARIN | CA | 9th Apr 1993 |
| 198.73.89.0/24 | 256 | ARIN | CA | 9th Apr 1993 |
| 198.73.90.0/24 | 256 | ARIN | CA | 9th Apr 1993 |
| 198.73.91.0/24 | 256 | ARIN | CA | 9th Apr 1993 |
| 198.73.92.0/24 | 256 | ARIN | CA | 9th Apr 1993 |
| 198.73.93.0/24 | 256 | ARIN | CA | 9th Apr 1993 |
| 198.73.94.0/24 | 256 | ARIN | CA | 9th Apr 1993 |
| 198.73.95.0/24 | 256 | ARIN |  US | 20th Nov 2013 |
| 198.74.132.0/22 | 1k | ARIN | US | 3rd Sept 1993 |
| 198.74.136.0/21 | 2k | ARIN | US | 3rd Sept 1993 |
| 198.74.144.0/20 | 4.1k | ARIN | US | 3rd Sept 1993 |
| 198.74.16.0/21 | 2k | ARIN | US | 22nd Feb 1993 |
| 198.74.192.0/19 | 8.2k | ARIN | US | 3rd Sept 1993 |
| 198.74.24.0/23 | 512 | APNIC |  JP | 22nd Feb 1993 |
| 198.74.26.0/23 | 512 | APNIC |  SG | 22nd Feb 1993 |
| 198.74.40.0/23 | 512 | ARIN | US | 25th Feb 1993 |
| 198.74.44.0/22 | 1k | ARIN | US | 6th Mar 2013 |
| 198.74.64.0/21 | 2k | ARIN | US | 26th Feb 1993 |
| 198.74.72.0/23 | 512 | ARIN | US | 26th Feb 1993 |
| 198.74.8.0/21 | 2k | ARIN | US | 24th Feb 1993 |
| 198.75.0.0/16 | 65.5k | ARIN | US | 23rd Feb 1993 |
| 198.8.48.0/21 | 2k | ARIN | US | 21st Dec 1992 |
| 198.8.56.0/24 | 256 | ARIN | US | 21st Dec 1992 |
| 198.8.68.0/23 | 512 | ARIN | US | 26th Feb 1993 |
| 198.84.10.0/24 | 256 | ARIN | US | 24th Feb 1993 |
| 198.84.11.0/24 | 256 | ARIN | US | 24th Feb 1993 |
| 198.84.12.0/24 | 256 | ARIN | US | 24th Feb 1993 |
| 198.84.32.0/20 | 4.1k | ARIN | US | 9th Mar 1993 |
| 198.84.4.0/22 | 1k | ARIN | US | 3rd Mar 1993 |
| 198.84.48.0/21 | 2k | ARIN | US | 9th Mar 1993 |
| 198.89.0.0/22 | 1k | ARIN | US | 2nd Mar 1993 |
| 198.89.12.0/23 | 512 | ARIN | CA | 5th Mar 1993 |
| 198.89.14.0/24 | 256 | ARIN | CA | 5th Mar 1993 |
| 198.89.16.0/21 | 2k | ARIN | US | 2nd Mar 1993 |
| 198.89.176.0/21 | 2k | ARIN | US | 12th May 1993 |
| 198.89.184.0/23 | 512 | ARIN | US | 12th May 1993 |
| 198.89.191.0/24 | 256 | ARIN | US | 12th May 1993 |
| 198.89.24.0/23 | 512 | ARIN | US | 2nd Mar 1993 |
| 198.89.4.0/23 | 512 | ARIN | US | 5th Mar 1993 |
| 198.89.6.0/24 | 256 | ARIN | US | 5th Mar 1993 |
| 198.89.84.0/24 | 256 | ARIN | US | 12th Nov 1993 |
| 198.90.0.0/22 | 1k | ARIN | US | 8th Mar 1993 |
| 198.90.12.0/23 | 512 | ARIN | US | 3rd Mar 1993 |
| 198.90.128.0/17 | 32.8k | ARIN | US | 7th Apr 1993 |
| 198.90.16.0/22 | 1k | ARIN | US | 3rd Mar 1993 |
| 198.90.32.0/19 | 8.2k | ARIN | US | 5th Mar 1993 |
| 198.90.4.0/24 | 256 | ARIN | US | 8th Mar 1993 |