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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,124 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 192.139.230.0/24 | 256 | ARIN |  CA | 2nd Sept 1992 |
| 192.139.232.0/24 | 256 | ARIN | CA | 1st Oct 1992 |
| 192.139.234.0/24 | 256 | ARIN | CA | 1st Oct 1992 |
| 192.139.235.0/24 | 256 | ARIN | CA | 1st Oct 1992 |
| 192.139.236.0/24 | 256 | ARIN | CA | 1st Oct 1992 |
| 192.139.238.0/24 | 256 | ARIN | CA | 2nd Oct 1992 |
| 192.139.239.0/24 | 256 | ARIN | CA | 2nd Oct 1992 |
| 192.139.24.0/24 | 256 | ARIN | CA | 19th Feb 1992 |
| 192.139.240.0/24 | 256 | ARIN | CA | 2nd Oct 1992 |
| 192.139.241.0/24 | 256 | ARIN | CA | 2nd Oct 1992 |
| 192.139.242.0/24 | 256 | ARIN | CA | 2nd Oct 1992 |
| 192.139.243.0/24 | 256 | ARIN | CA | 2nd Oct 1992 |
| 192.139.244.0/24 | 256 | ARIN | CA | 2nd Oct 1992 |
| 192.139.246.0/24 | 256 | ARIN | CA | 2nd Oct 1992 |
| 192.139.247.0/24 | 256 | ARIN | CA | 2nd Oct 1992 |
| 192.139.248.0/24 | 256 | ARIN | CA | 2nd Oct 1992 |
| 192.139.249.0/24 | 256 | ARIN | CA | 2nd Oct 1992 |
| 192.139.25.0/24 | 256 | ARIN | CA | 23rd Jun 1993 |
| 192.139.250.0/24 | 256 | ARIN | CA | 2nd Oct 1992 |
| 192.139.251.0/24 | 256 | ARIN | CA | 2nd Oct 1992 |
| 192.139.252.0/24 | 256 | ARIN | CA | 26th Oct 1992 |
| 192.139.253.0/24 | 256 | ARIN | CA | 24th May 1993 |
| 192.139.254.0/24 | 256 | ARIN | CA | 26th Oct 1992 |
| 192.139.28.0/24 | 256 | ARIN | CA | 26th Feb 1992 |
| 192.139.31.0/24 | 256 | ARIN | CA | 26th Feb 1992 |
| 192.139.32.0/24 | 256 | ARIN | CA | 26th Feb 1992 |
| 192.139.37.0/24 | 256 | ARIN | CA | 3rd Oct 2024 |
| 192.139.4.0/24 | 256 | ARIN | CA | 24th Jan 1992 |
| 192.139.42.0/24 | 256 | ARIN | CA | 1st Dec 1995 |
| 192.139.43.0/24 | 256 | ARIN | CA | 17th May 1994 |
| 192.139.44.0/24 | 256 | ARIN | CA | 3rd Mar 1992 |
| 192.139.45.0/24 | 256 | ARIN | CA | 10th Mar 1992 |
| 192.139.63.0/24 | 256 | ARIN | CA | 19th Mar 1992 |
| 192.139.64.0/24 | 256 | ARIN | CA | 19th Mar 1992 |
| 192.139.65.0/24 | 256 | ARIN | CA | 19th Mar 1992 |
| 192.139.66.0/24 | 256 | ARIN | CA | 19th Mar 1992 |
| 192.139.67.0/24 | 256 | ARIN | CA | 19th Mar 1992 |
| 192.139.68.0/24 | 256 | ARIN | CA | 19th Mar 1992 |
| 192.139.72.0/24 | 256 | ARIN | CA | 1st Apr 1992 |
| 192.139.73.0/24 | 256 | ARIN | CA | 2nd Apr 1992 |
| 192.139.74.0/24 | 256 | ARIN | CA | 12th Apr 1993 |
| 192.139.75.0/24 | 256 | ARIN | CA | 23rd Nov 1992 |
| 192.139.77.0/24 | 256 | ARIN | CA | 24th Apr 1992 |
| 192.139.78.0/24 | 256 | RIPE NCC |  FR | 23rd Apr 1992 |
| 192.139.8.0/24 | 256 | ARIN | CA | 3rd Nov 1992 |
| 192.139.82.0/24 | 256 | ARIN | CA | 18th Feb 1996 |
| 192.139.84.0/22 | 1k | ARIN | CA | 13th May 1992 |
| 192.139.88.0/21 | 2k | ARIN | CA | 13th May 1992 |
| 192.139.9.0/24 | 256 | ARIN | CA | 28th Jan 1992 |
| 192.139.96.0/20 | 4.1k | ARIN | CA | 13th May 1992 |