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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,201 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 192.46.196.0/22 | 1k | ARIN |  US | 20th Dec 1988 |
| 192.46.206.0/23 | 512 | ARIN | US | 20th Dec 1988 |
| 192.46.240.0/23 | 512 | ARIN | US | 20th Dec 1988 |
| 192.46.242.0/24 | 256 | ARIN | US | 20th Dec 1988 |
| 192.46.243.0/24 | 256 | ARIN | US | 20th Dec 1988 |
| 192.46.244.0/22 | 1k | ARIN | US | 20th Dec 1988 |
| 192.46.248.0/23 | 512 | ARIN | US | 20th Dec 1988 |
| 192.46.250.0/23 | 512 | ARIN | US | 20th Dec 1988 |
| 192.46.252.0/22 | 1k | ARIN | US | 20th Dec 1988 |
| 192.46.32.0/21 | 2k | ARIN | US | 20th Dec 1988 |
| 192.46.40.0/23 | 512 | ARIN | US | 20th Dec 1988 |
| 192.46.42.0/24 | 256 | ARIN | US | 20th Dec 1988 |
| 192.46.43.0/24 | 256 | ARIN | US | 20th Dec 1988 |
| 192.46.44.0/22 | 1k | ARIN | US | 20th Dec 1988 |
| 192.46.48.0/22 | 1k | ARIN | US | 20th Dec 1988 |
| 192.46.54.0/24 | 256 | ARIN | US | 20th Dec 1988 |
| 192.46.55.0/24 | 256 | ARIN | US | 20th Dec 1988 |
| 192.46.56.0/21 | 2k | ARIN | US | 20th Dec 1988 |
| 192.46.64.0/22 | 1k | ARIN | US | 20th Dec 1988 |
| 192.46.68.0/22 | 1k | ARIN | US | 20th Dec 1988 |
| 192.46.72.0/22 | 1k | ARIN | US | 20th Dec 1988 |
| 192.46.76.0/23 | 512 | ARIN | US | 20th Dec 1988 |
| 192.46.78.0/24 | 256 | ARIN | US | 20th Dec 1988 |
| 192.46.79.0/24 | 256 | ARIN | US | 20th Dec 1988 |
| 192.46.82.0/23 | 512 | ARIN | US | 20th Dec 1988 |
| 192.46.84.0/22 | 1k | ARIN | US | 20th Dec 1988 |
| 192.46.89.0/24 | 256 | ARIN | US | 20th Dec 1988 |
| 192.46.90.0/23 | 512 | ARIN | US | 20th Dec 1988 |
| 192.46.92.0/22 | 1k | ARIN | US | 20th Dec 1988 |
| 192.46.96.0/21 | 2k | ARIN | US | 20th Dec 1988 |
| 192.47.0.0/24 | 256 | APNIC |  JP | 12th Jan 1989 |
| 192.47.100.0/24 | 256 | APNIC | JP | 30th Dec 1992 |
| 192.47.101.0/24 | 256 | APNIC | JP | 30th Dec 1992 |
| 192.47.102.0/24 | 256 | APNIC | JP | 30th Dec 1992 |
| 192.47.103.0/24 | 256 | APNIC | JP | 30th Dec 1992 |
| 192.47.104.0/24 | 256 | APNIC | JP | 30th Dec 1992 |
| 192.47.105.0/24 | 256 | APNIC | JP | 30th Dec 1992 |
| 192.47.106.0/24 | 256 | APNIC | JP | 30th Dec 1992 |
| 192.47.107.0/24 | 256 | APNIC | JP | 30th Dec 1992 |
| 192.47.108.0/24 | 256 | APNIC | JP | 30th Dec 1992 |
| 192.47.109.0/24 | 256 | APNIC | JP | 30th Dec 1992 |
| 192.47.110.0/24 | 256 | APNIC | JP | 30th Dec 1992 |
| 192.47.111.0/24 | 256 | APNIC | JP | 30th Dec 1992 |
| 192.47.112.0/24 | 256 | APNIC | JP | 30th Dec 1992 |
| 192.47.113.0/24 | 256 | APNIC | JP | 30th Dec 1992 |
| 192.47.114.0/24 | 256 | APNIC | JP | 30th Dec 1992 |
| 192.47.115.0/24 | 256 | APNIC | JP | 30th Dec 1992 |
| 192.47.116.0/24 | 256 | APNIC | JP | 30th Dec 1992 |
| 192.47.117.0/24 | 256 | APNIC | JP | 30th Dec 1992 |
| 192.47.118.0/24 | 256 | APNIC | JP | 30th Dec 1992 |