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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 in Canada
3,819 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 199.246.47.0/24 | 256 | ARIN |  CA | 14th May 1994 |
| 199.246.56.0/23 | 512 | ARIN | CA | 14th May 1994 |
| 199.246.6.0/24 | 256 | ARIN | CA | 14th May 1994 |
| 199.246.60.0/22 | 1k | ARIN | CA | 8th Jul 1994 |
| 199.246.64.0/21 | 2k | ARIN | CA | 8th Jul 1994 |
| 199.246.7.0/24 | 256 | ARIN | CA | 14th May 1994 |
| 199.246.75.0/24 | 256 | ARIN | CA | 14th May 1994 |
| 199.247.156.0/23 | 512 | ARIN | CA | 6th Dec 2022 |
| 199.247.158.0/24 | 256 | ARIN | CA | 28th Apr 1994 |
| 199.247.51.0/24 | 256 | ARIN | CA | 9th Apr 1996 |
| 199.247.84.0/24 | 256 | ARIN | CA | 9th Apr 1996 |
| 199.254.152.0/24 | 256 | ARIN | CA | 14th Oct 1994 |
| 199.254.235.0/24 | 256 | ARIN | CA | 3rd Apr 1996 |
| 199.26.80.0/22 | 1k | ARIN | CA | 17th Oct 2011 |
| 199.27.190.0/24 | 256 | ARIN | CA | 13th Mar 2018 |
| 199.43.1.0/24 | 256 | ARIN | CA | 5th Jan 1994 |
| 199.43.110.0/24 | 256 | ARIN | CA | 4th Feb 1994 |
| 199.43.111.0/24 | 256 | ARIN | CA | 9th Feb 1994 |
| 199.43.112.0/24 | 256 | ARIN | CA | 22nd Feb 1994 |
| 199.43.113.0/24 | 256 | ARIN | CA | 6th Jun 1994 |
| 199.43.116.0/24 | 256 | ARIN | CA | 8th Mar 1994 |
| 199.43.117.0/24 | 256 | ARIN | CA | 11th Mar 1994 |
| 199.43.118.0/24 | 256 | ARIN | CA | 29th Mar 1994 |
| 199.43.122.0/24 | 256 | ARIN | CA | 26th Apr 1994 |
| 199.43.123.0/24 | 256 | ARIN | CA | 26th Apr 1994 |
| 199.43.124.0/22 | 1k | ARIN | CA | 26th Apr 1994 |
| 199.43.128.0/23 | 512 | ARIN | CA | 26th Apr 1994 |
| 199.43.136.0/21 | 2k | ARIN | CA | 14th Mar 1994 |
| 199.43.144.0/23 | 512 | ARIN | CA | 10th Jul 2014 |
| 199.43.147.0/24 | 256 | ARIN | CA | 14th Mar 1994 |
| 199.43.150.0/23 | 512 | ARIN | CA | 10th Mar 1994 |
| 199.43.152.0/21 | 2k | ARIN | CA | 10th Mar 1994 |
| 199.43.160.0/21 | 2k | ARIN | CA | 10th Mar 1994 |
| 199.43.168.0/22 | 1k | ARIN | CA | 10th Mar 1994 |
| 199.43.2.0/24 | 256 | ARIN | CA | 12th Jan 1994 |
| 199.43.243.0/24 | 256 | ARIN | CA | 7th Dec 1993 |
| 199.43.244.0/23 | 512 | ARIN | CA | 7th Dec 1993 |
| 199.43.248.0/24 | 256 | ARIN | CA | 17th May 1994 |
| 199.43.3.0/24 | 256 | ARIN | CA | 1st Feb 1994 |
| 199.48.168.0/24 | 256 | ARIN | CA | 17th Jan 2018 |
| 199.48.216.0/21 | 2k | ARIN | CA | 2nd Nov 2010 |
| 199.60.117.0/24 | 256 | ARIN | CA | 23rd Nov 1993 |
| 199.60.121.0/24 | 256 | ARIN | CA | 23rd Nov 1993 |
| 199.60.122.0/24 | 256 | ARIN | CA | 23rd Nov 1994 |
| 199.60.128.0/20 | 4.1k | ARIN | CA | 3rd Mar 1994 |
| 199.60.152.0/22 | 1k | ARIN | CA | 29th Mar 1994 |
| 199.60.156.0/23 | 512 | ARIN | CA | 4th Apr 1994 |
| 199.60.158.0/24 | 256 | ARIN | CA | 4th Apr 1994 |
| 199.60.159.0/24 | 256 | ARIN | CA | 23rd Nov 1993 |
| 199.60.192.0/20 | 4.1k | ARIN | CA | 3rd Jan 1994 |