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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 unannounced space registered through ARIN, largest first.
Unannounced blocks registered through ARIN
30,479 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 198.200.210.0/24 | 256 | ARIN |  US | 7th Apr 1994 |
| 198.200.211.0/24 | 256 | ARIN | US | 7th Apr 1994 |
| 198.200.218.0/24 | 256 | ARIN | US | 7th Apr 1994 |
| 198.200.219.0/24 | 256 | ARIN | US | 7th Apr 1994 |
| 198.200.221.0/24 | 256 | ARIN | US | 7th Apr 1994 |
| 198.200.222.0/23 | 512 | ARIN | US | 7th Apr 1994 |
| 198.200.224.0/23 | 512 | ARIN | US | 7th Apr 1994 |
| 198.200.226.0/24 | 256 | ARIN | US | 8th Apr 1994 |
| 198.200.227.0/24 | 256 | ARIN | US | 11th Apr 1994 |
| 198.200.228.0/24 | 256 | ARIN | US | 11th Apr 1994 |
| 198.200.229.0/24 | 256 | ARIN | US | 11th Apr 1994 |
| 198.200.230.0/23 | 512 | ARIN | US | 11th Apr 1994 |
| 198.200.232.0/23 | 512 | ARIN | US | 11th Apr 1994 |
| 198.200.234.0/24 | 256 | ARIN | US | 11th Apr 1994 |
| 198.200.235.0/24 | 256 | ARIN | US | 11th Apr 1994 |
| 198.200.237.0/24 | 256 | ARIN | US | 11th Apr 1994 |
| 198.200.239.0/24 | 256 | ARIN | US | 11th Apr 1994 |
| 198.200.243.0/24 | 256 | ARIN | US | 12th Apr 1994 |
| 198.200.245.0/24 | 256 | ARIN | US | 8th Dec 1995 |
| 198.200.247.0/24 | 256 | ARIN | US | 12th Apr 1994 |
| 198.200.248.0/24 | 256 | ARIN | US | 12th Apr 1994 |
| 198.200.249.0/24 | 256 | ARIN | US | 12th Apr 1994 |
| 198.200.251.0/24 | 256 | ARIN | US | 12th Apr 1994 |
| 198.200.252.0/22 | 1k | ARIN | US | 21st Mar 1994 |
| 198.200.28.0/22 | 1k | ARIN |  CA | 27th Mar 2020 |
| 198.202.131.0/24 | 256 | ARIN | US | 6th Oct 1993 |
| 198.202.132.0/22 | 1k | ARIN | US | 6th Oct 1993 |
| 198.202.136.0/24 | 256 | ARIN | US | 6th Oct 1993 |
| 198.202.138.0/24 | 256 | ARIN | US | 6th Oct 1993 |
| 198.202.140.0/24 | 256 | ARIN | US | 7th Oct 1993 |
| 198.202.147.0/24 | 256 | ARIN | US | 8th Oct 1993 |
| 198.202.149.0/24 | 256 | ARIN | US | 8th Oct 1993 |
| 198.202.150.0/24 | 256 | ARIN | US | 8th Oct 1993 |
| 198.202.152.0/24 | 256 | ARIN | US | 8th Oct 1993 |
| 198.202.153.0/24 | 256 | ARIN | US | 8th Oct 1993 |
| 198.202.154.0/24 | 256 | ARIN | US | 11th Oct 1993 |
| 198.202.155.0/24 | 256 | ARIN | US | 11th Oct 1993 |
| 198.202.156.0/24 | 256 | ARIN | US | 11th Oct 1993 |
| 198.202.157.0/24 | 256 | ARIN | US | 11th Oct 1993 |
| 198.202.158.0/24 | 256 | ARIN | US | 11th Oct 1993 |
| 198.202.159.0/24 | 256 | ARIN | US | 11th Oct 1993 |
| 198.202.160.0/24 | 256 | ARIN | US | 11th Oct 1993 |
| 198.202.161.0/24 | 256 | ARIN | US | 11th Oct 1993 |
| 198.202.162.0/24 | 256 | ARIN | US | 11th Oct 1993 |
| 198.202.163.0/24 | 256 | ARIN | US | 11th Oct 1993 |
| 198.202.164.0/24 | 256 | ARIN | US | 11th Oct 1993 |
| 198.202.165.0/24 | 256 | ARIN | US | 11th Oct 1993 |
| 198.202.166.0/24 | 256 | ARIN | US | 11th Oct 1993 |
| 198.202.167.0/24 | 256 | ARIN | US | 11th Oct 1993 |
| 198.202.168.0/24 | 256 | ARIN | US | 11th Oct 1993 |