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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 in Canada
3,775 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 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 |
| 198.97.237.0/24 | 256 | ARIN | CA | 17th Dec 2013 |
| 198.99.170.0/24 | 256 | ARIN | CA | 16th Apr 1993 |
| 198.99.218.0/24 | 256 | ARIN | CA | 27th Apr 1993 |
| 198.99.219.0/24 | 256 | ARIN | CA | 27th Apr 1993 |
| 198.99.220.0/24 | 256 | ARIN | CA | 27th Apr 1993 |
| 198.99.221.0/24 | 256 | ARIN | CA | 27th Apr 1993 |
| 199.101.64.0/22 | 1k | ARIN | CA | 3rd Apr 2025 |
| 199.102.156.0/22 | 1k | ARIN | CA | 10th Mar 2011 |
| 199.122.116.0/22 | 1k | ARIN | CA | 13th Mar 2012 |
| 199.122.7.0/24 | 256 | ARIN | CA | 10th Aug 2012 |
| 199.127.44.0/22 | 1k | ARIN | CA | 9th Jan 2019 |
| 199.164.129.0/24 | 256 | ARIN | CA | 10th Mar 1994 |
| 199.166.1.0/24 | 256 | ARIN | CA | 13th May 1994 |
| 199.166.160.0/20 | 4.1k | ARIN | CA | 2nd Feb 1994 |
| 199.166.176.0/21 | 2k | ARIN | CA | 2nd Feb 1994 |
| 199.166.190.0/23 | 512 | ARIN | CA | 2nd Feb 1994 |
| 199.166.192.0/23 | 512 | ARIN | CA | 2nd Feb 1994 |
| 199.166.194.0/24 | 256 | ARIN | CA | 2nd Feb 1994 |
| 199.166.195.0/24 | 256 | ARIN | CA | 2nd Feb 1994 |
| 199.166.196.0/23 | 512 | ARIN | CA | 2nd Feb 1994 |
| 199.166.2.0/24 | 256 | ARIN | CA | 2nd Feb 1994 |
| 199.166.20.0/24 | 256 | ARIN | CA | 26th Apr 1994 |
| 199.166.200.0/22 | 1k | ARIN | CA | 2nd Feb 1994 |
| 199.166.204.0/24 | 256 | ARIN | CA | 2nd Feb 1994 |
| 199.166.205.0/24 | 256 | ARIN | CA | 2nd Feb 1994 |
| 199.166.208.0/24 | 256 | ARIN | CA | 2nd Feb 1994 |
| 199.166.21.0/24 | 256 | ARIN | CA | 16th May 1994 |
| 199.166.211.0/24 | 256 | ARIN | CA | 2nd Feb 1994 |
| 199.166.213.0/24 | 256 | ARIN | CA | 2nd Feb 1994 |
| 199.166.214.0/23 | 512 | ARIN | CA | 2nd Feb 1994 |
| 199.166.22.0/24 | 256 | ARIN | CA | 1st Jun 1994 |
| 199.166.220.0/22 | 1k | ARIN | CA | 2nd Feb 1994 |
| 199.166.224.0/23 | 512 | ARIN | CA | 2nd Feb 1994 |
| 199.166.226.0/24 | 256 | ARIN | CA | 2nd Feb 1994 |
| 199.166.229.0/24 | 256 | ARIN | CA | 2nd Feb 1994 |
| 199.166.23.0/24 | 256 | ARIN | CA | 22nd Jun 1994 |
| 199.166.234.0/23 | 512 | ARIN | CA | 2nd Feb 1994 |
| 199.166.237.0/24 | 256 | ARIN | CA | 2nd Feb 1994 |
| 199.166.238.0/24 | 256 | ARIN | CA | 2nd Feb 1994 |
| 199.166.239.0/24 | 256 | ARIN | CA | 2nd Feb 1994 |
| 199.166.246.0/24 | 256 | ARIN | CA | 2nd Feb 1994 |
| 199.166.247.0/24 | 256 | ARIN | CA | 14th May 1994 |