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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
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Countries with the most unannounced blocks, largest first.
Unannounced blocks
85,310 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 199.83.144.0/21 | 2k | ARIN |  US | 19th Jan 2011 |
| 199.83.16.0/21 | 2k | ARIN | US | 7th Dec 1993 |
| 199.83.176.0/22 | 1k | ARIN | US | 21st Jan 2011 |
| 199.83.24.0/24 | 256 | ARIN | US | 7th Dec 1993 |
| 199.83.25.0/24 | 256 | ARIN | US | 8th Sept 2015 |
| 199.83.8.0/22 | 1k | ARIN | US | 13th Dec 1993 |
| 199.83.96.0/22 | 1k | ARIN | US | 18th Jan 2012 |
| 199.84.0.0/24 | 256 | ARIN | US | 15th Nov 2012 |
| 199.84.1.0/24 | 256 | ARIN |  CA | 3rd Jan 1994 |
| 199.84.135.0/24 | 256 | ARIN | CA | 23rd Jun 1994 |
| 199.84.145.0/24 | 256 | ARIN | CA | 8th Dec 1993 |
| 199.84.146.0/24 | 256 | ARIN | CA | 22nd Jun 1994 |
| 199.84.148.0/23 | 512 | ARIN | CA | 6th Jun 1994 |
| 199.84.150.0/23 | 512 | ARIN | CA | 26th Feb 1996 |
| 199.84.152.0/24 | 256 | ARIN | CA | 8th Dec 1993 |
| 199.84.153.0/24 | 256 | ARIN | CA | 23rd May 1994 |
| 199.84.154.0/24 | 256 | ARIN | CA | 17th May 1994 |
| 199.84.155.0/24 | 256 | ARIN | CA | 17th May 1994 |
| 199.84.156.0/24 | 256 | ARIN | CA | 17th May 1994 |
| 199.84.16.0/20 | 4.1k | ARIN | CA | 20th Dec 1993 |
| 199.84.160.0/23 | 512 | ARIN | CA | 1st Jun 1994 |
| 199.84.165.0/24 | 256 | ARIN | CA | 8th Dec 1993 |
| 199.84.166.0/23 | 512 | ARIN | CA | 8th Dec 1993 |
| 199.84.168.0/22 | 1k | ARIN | CA | 8th Dec 1993 |
| 199.84.172.0/24 | 256 | ARIN | CA | 8th Dec 1993 |
| 199.84.176.0/24 | 256 | ARIN | CA | 8th Dec 1993 |
| 199.84.177.0/24 | 256 | ARIN | CA | 8th Dec 1993 |
| 199.84.178.0/24 | 256 | ARIN | CA | 8th Dec 1993 |
| 199.84.179.0/24 | 256 | ARIN | CA | 8th Dec 1993 |
| 199.84.180.0/23 | 512 | ARIN | CA | 8th Dec 1993 |
| 199.84.182.0/23 | 512 | ARIN | CA | 12th May 1994 |
| 199.84.184.0/21 | 2k | ARIN | CA | 4th Apr 1994 |
| 199.84.192.0/20 | 4.1k | ARIN | CA | 4th Apr 1994 |
| 199.84.2.0/23 | 512 | ARIN | CA | 20th Jan 1994 |
| 199.84.208.0/22 | 1k | ARIN | CA | 31st Mar 1994 |
| 199.84.224.0/21 | 2k | ARIN | CA | 1st Mar 1994 |
| 199.84.246.0/23 | 512 | ARIN | CA | 17th May 1994 |
| 199.84.252.0/23 | 512 | ARIN | CA | 8th Dec 1993 |
| 199.84.254.0/24 | 256 | ARIN | CA | 8th Dec 1993 |
| 199.84.32.0/22 | 1k | ARIN | CA | 3rd Jan 1994 |
| 199.84.36.0/23 | 512 | ARIN | CA | 3rd Jan 1994 |
| 199.84.40.0/24 | 256 | ARIN | CA | 27th Jan 1994 |
| 199.84.41.0/24 | 256 | ARIN | CA | 13th May 1994 |
| 199.84.48.0/22 | 1k | ARIN | CA | 8th Dec 1993 |
| 199.84.52.0/23 | 512 | ARIN | CA | 8th Dec 1993 |
| 199.84.54.0/24 | 256 | ARIN | CA | 8th Dec 1993 |
| 199.84.55.0/24 | 256 | ARIN | CA | 8th Dec 1993 |
| 199.84.56.0/22 | 1k | ARIN | CA | 8th Dec 1993 |
| 199.84.6.0/23 | 512 | ARIN | CA | 16th Dec 1993 |
| 199.84.60.0/24 | 256 | ARIN | CA | 8th Dec 1993 |