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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 unannounced space registered through ARIN, largest first.
Unannounced blocks registered through ARIN
30,479 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 198.96.248.0/21 | 2k | ARIN |  CA | 11th Mar 1993 |
| 198.96.28.0/24 | 256 | ARIN | CA | 31st Aug 1993 |
| 198.96.30.0/23 | 512 | ARIN | CA | 10th Sept 1993 |
| 198.96.4.0/24 | 256 | ARIN |  US | 24th Feb 2014 |
| 198.96.40.0/22 | 1k | ARIN | CA | 13th Jul 1993 |
| 198.96.48.0/21 | 2k | ARIN | CA | 13th Jul 1993 |
| 198.96.5.0/24 | 256 | ARIN | US | 24th Feb 2014 |
| 198.96.56.0/22 | 1k | ARIN | CA | 13th Jul 1993 |
| 198.96.6.0/24 | 256 | ARIN | CA | 6th Jul 1993 |
| 198.96.60.0/24 | 256 | ARIN | CA | 13th Jul 1993 |
| 198.96.61.0/24 | 256 | ARIN | CA | 6th Oct 1993 |
| 198.96.64.0/21 | 2k | ARIN | CA | 11th Mar 1993 |
| 198.96.7.0/24 | 256 | ARIN | CA | 20th Sept 1993 |
| 198.96.72.0/22 | 1k | ARIN | CA | 11th Mar 1993 |
| 198.96.8.0/24 | 256 | ARIN | CA | 14th Jun 1993 |
| 198.96.9.0/24 | 256 | ARIN | CA | 14th Jun 1993 |
| 198.97.0.0/22 | 1k | ARIN | US | 11th Mar 1993 |
| 198.97.12.0/24 | 256 | ARIN | US | 11th Mar 1993 |
| 198.97.16.0/21 | 2k | ARIN | US | 12th Mar 1993 |
| 198.97.216.0/21 | 2k | ARIN | US | 16th Apr 2013 |
| 198.97.237.0/24 | 256 | ARIN | CA | 17th Dec 2013 |
| 198.97.238.0/23 | 512 | ARIN | US | 28th Feb 2014 |
| 198.97.24.0/22 | 1k | ARIN | US | 12th Mar 1993 |
| 198.97.28.0/23 | 512 | ARIN | US | 12th Mar 1993 |
| 198.97.32.0/24 | 256 | ARIN | US | 11th Mar 1993 |
| 198.97.33.0/24 | 256 | ARIN | US | 11th Mar 1993 |
| 198.97.34.0/24 | 256 | ARIN | US | 11th Mar 1993 |
| 198.97.35.0/24 | 256 | ARIN | US | 11th Mar 1993 |
| 198.97.36.0/24 | 256 | ARIN | US | 11th Mar 1993 |
| 198.97.37.0/24 | 256 | ARIN | US | 12th Mar 1993 |
| 198.97.39.0/24 | 256 | ARIN | US | 12th Mar 1993 |
| 198.97.40.0/24 | 256 | ARIN | US | 12th Mar 1993 |
| 198.97.45.0/24 | 256 | ARIN | US | 17th Mar 1993 |
| 198.97.47.0/24 | 256 | ARIN | US | 17th Mar 1993 |
| 198.97.48.0/24 | 256 | ARIN | US | 17th Mar 1993 |
| 198.97.49.0/24 | 256 | ARIN | US | 17th Mar 1993 |
| 198.97.50.0/24 | 256 | ARIN | US | 17th Mar 1993 |
| 198.97.54.0/24 | 256 | ARIN | US | 18th Mar 1993 |
| 198.97.55.0/24 | 256 | ARIN | US | 18th Mar 1993 |
| 198.97.56.0/24 | 256 | ARIN | US | 18th Mar 1993 |
| 198.97.57.0/24 | 256 | ARIN | US | 18th Mar 1993 |
| 198.97.61.0/24 | 256 | ARIN | US | 19th Mar 1993 |
| 198.97.63.0/24 | 256 | ARIN | US | 19th Mar 1993 |
| 198.97.65.0/24 | 256 | ARIN | US | 19th Mar 1993 |
| 198.97.66.0/24 | 256 | ARIN | US | 19th Mar 1993 |
| 198.97.69.0/24 | 256 | ARIN | US | 26th Mar 1993 |
| 198.97.70.0/24 | 256 | ARIN | US | 26th Mar 1993 |
| 198.97.71.0/24 | 256 | ARIN | US | 29th Mar 1993 |
| 198.97.8.0/22 | 1k | ARIN | US | 11th Mar 1993 |
| 198.97.80.0/24 | 256 | ARIN | US | 8th Apr 1993 |