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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,195 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 192.70.157.0/24 | 256 | RIPE NCC |  DE | 23rd May 1990 |
| 192.70.158.0/24 | 256 | RIPE NCC | DE | 23rd May 1990 |
| 192.70.159.0/24 | 256 | RIPE NCC | DE | 23rd May 1990 |
| 192.70.160.0/24 | 256 | ARIN |  US | 15th Jun 1990 |
| 192.70.162.0/24 | 256 | ARIN | US | 18th Jun 1990 |
| 192.70.165.0/24 | 256 | ARIN | US | 18th Jun 1990 |
| 192.70.166.0/24 | 256 | ARIN | US | 18th Jun 1990 |
| 192.70.167.0/24 | 256 | ARIN | US | 20th Jun 1990 |
| 192.70.168.0/24 | 256 | ARIN | US | 20th Jun 1990 |
| 192.70.169.0/24 | 256 | ARIN | US | 20th Jun 1990 |
| 192.70.170.0/24 | 256 | ARIN | US | 20th Jun 1990 |
| 192.70.173.0/24 | 256 | ARIN | US | 21st Jun 1990 |
| 192.70.185.0/24 | 256 | ARIN | US | 9th Apr 1990 |
| 192.70.189.0/24 | 256 | ARIN | US | 2nd Apr 1990 |
| 192.70.201.0/24 | 256 | AFRINIC |  CI | 28th Feb 2020 |
| 192.70.203.0/24 | 256 | ARIN | US | 6th Apr 1990 |
| 192.70.204.0/24 | 256 | ARIN | US | 9th Apr 1990 |
| 192.70.205.0/24 | 256 | ARIN | US | 9th Apr 1990 |
| 192.70.209.0/24 | 256 | ARIN | US | 9th Apr 1990 |
| 192.70.210.0/24 | 256 | ARIN | US | 9th Apr 1990 |
| 192.70.211.0/24 | 256 | ARIN | US | 9th Apr 1990 |
| 192.70.212.0/24 | 256 | ARIN | US | 9th Apr 1990 |
| 192.70.214.0/24 | 256 | ARIN | US | 3rd Apr 2025 |
| 192.70.215.0/24 | 256 | ARIN | US | 9th Apr 1990 |
| 192.70.217.0/24 | 256 | ARIN | US | 9th Apr 1990 |
| 192.70.219.0/24 | 256 | APNIC |  AU | 9th Apr 1990 |
| 192.70.221.0/24 | 256 | ARIN | US | 9th Apr 1990 |
| 192.70.223.0/24 | 256 | ARIN | US | 9th Apr 1990 |
| 192.70.224.0/24 | 256 | ARIN |  CA | 9th Apr 1990 |
| 192.70.225.0/24 | 256 | ARIN | US | 9th Apr 1990 |
| 192.70.237.0/24 | 256 | AFRINIC |  ZA | 12th Apr 1990 |
| 192.70.240.0/24 | 256 | ARIN | US | 25th Jun 1990 |
| 192.70.241.0/24 | 256 | ARIN | US | 25th Jun 1990 |
| 192.70.244.0/24 | 256 | ARIN | US | 12th Apr 1990 |
| 192.70.248.0/24 | 256 | ARIN | US | 16th Apr 1990 |
| 192.70.250.0/24 | 256 | ARIN | US | 19th Apr 1990 |
| 192.70.251.0/24 | 256 | ARIN | US | 19th Apr 1990 |
| 192.70.254.0/24 | 256 | ARIN | US | 19th Apr 1990 |
| 192.70.88.0/24 | 256 | RIPE NCC |  FR | 1st Sept 1993 |
| 192.70.91.0/24 | 256 | RIPE NCC | FR | 1st Sept 1993 |
| 192.70.92.0/22 | 1k | RIPE NCC | FR | 11th Apr 2005 |
| 192.70.96.0/24 | 256 | RIPE NCC | FR | 11th Apr 2005 |
| 192.70.97.0/24 | 256 | RIPE NCC | FR | 1st Sept 1993 |
| 192.72.2.0/24 | 256 | ARIN | US | 1st Dec 2014 |
| 192.72.252.0/24 | 256 | APNIC |  TW | 27th Jun 1990 |
| 192.72.253.0/24 | 256 | ARIN | US | 9th Jul 1990 |
| 192.72.3.0/24 | 256 | APNIC | TW | 9th Dec 1992 |
| 192.73.10.0/24 | 256 | ARIN | US | 3rd Jul 1990 |
| 192.73.14.0/24 | 256 | ARIN | US | 3rd Jul 1990 |
| 192.73.17.0/24 | 256 | ARIN | US | 4th Jul 1990 |