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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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.
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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 |
|---|---|---|---|---|
| 198.200.135.0/24 | 256 | ARIN |  US | 24th Mar 1994 |
| 198.200.136.0/24 | 256 | ARIN | US | 24th Mar 1994 |
| 198.200.138.0/24 | 256 | ARIN | US | 24th Mar 1994 |
| 198.200.140.0/24 | 256 | ARIN | US | 24th Mar 1994 |
| 198.200.141.0/24 | 256 | ARIN | US | 29th Nov 2012 |
| 198.200.142.0/24 | 256 | ARIN | US | 24th Mar 1994 |
| 198.200.143.0/24 | 256 | ARIN | US | 24th Mar 1994 |
| 198.200.144.0/24 | 256 | ARIN | US | 24th Mar 1994 |
| 198.200.145.0/24 | 256 | ARIN | US | 25th Mar 1994 |
| 198.200.146.0/24 | 256 | ARIN | US | 6th Dec 2019 |
| 198.200.147.0/24 | 256 | ARIN | US | 25th Oct 1994 |
| 198.200.150.0/24 | 256 | ARIN | US | 25th Mar 1994 |
| 198.200.151.0/24 | 256 | ARIN | US | 25th Mar 1994 |
| 198.200.152.0/24 | 256 | ARIN | US | 25th Mar 1994 |
| 198.200.153.0/24 | 256 | ARIN | US | 28th Mar 1994 |
| 198.200.154.0/24 | 256 | ARIN | US | 29th Mar 1994 |
| 198.200.155.0/24 | 256 | ARIN | US | 29th Mar 1994 |
| 198.200.156.0/24 | 256 | ARIN | US | 29th Mar 1994 |
| 198.200.157.0/24 | 256 | ARIN | US | 29th Mar 1994 |
| 198.200.159.0/24 | 256 | ARIN | US | 30th Mar 1994 |
| 198.200.160.0/24 | 256 | ARIN | US | 30th Mar 1994 |
| 198.200.161.0/24 | 256 | ARIN | US | 30th Mar 1994 |
| 198.200.162.0/24 | 256 | ARIN | US | 1st Apr 1994 |
| 198.200.164.0/24 | 256 | ARIN | US | 1st Apr 1994 |
| 198.200.165.0/24 | 256 | ARIN | US | 1st Apr 1994 |
| 198.200.166.0/24 | 256 | ARIN | US | 1st Apr 1994 |
| 198.200.167.0/24 | 256 | ARIN | US | 2nd Jul 2026 |
| 198.200.169.0/24 | 256 | ARIN | US | 1st Apr 1994 |
| 198.200.170.0/24 | 256 | ARIN | US | 1st Apr 1994 |
| 198.200.171.0/24 | 256 | ARIN | US | 1st Apr 1994 |
| 198.200.172.0/23 | 512 | ARIN | US | 1st Apr 1994 |
| 198.200.174.0/24 | 256 | ARIN | US | 1st Apr 1994 |
| 198.200.175.0/24 | 256 | ARIN | US | 30th Jul 2021 |
| 198.200.176.0/24 | 256 | ARIN | US | 1st Apr 1994 |
| 198.200.180.0/24 | 256 | ARIN | US | 1st Apr 1994 |
| 198.200.183.0/24 | 256 | ARIN | US | 4th Apr 1994 |
| 198.200.186.0/24 | 256 | ARIN | US | 6th Apr 1994 |
| 198.200.188.0/23 | 512 | ARIN | US | 6th Apr 1994 |
| 198.200.190.0/24 | 256 | ARIN | US | 6th Apr 1994 |
| 198.200.191.0/24 | 256 | ARIN | US | 6th Apr 1994 |
| 198.200.192.0/24 | 256 | ARIN | US | 6th Apr 1994 |
| 198.200.193.0/24 | 256 | ARIN | US | 6th Apr 1994 |
| 198.200.196.0/24 | 256 | ARIN | US | 6th Apr 1994 |
| 198.200.197.0/24 | 256 | ARIN | US | 6th Apr 1994 |
| 198.200.199.0/24 | 256 | ARIN | US | 6th Apr 1994 |
| 198.200.200.0/24 | 256 | ARIN | US | 6th Apr 1994 |
| 198.200.202.0/24 | 256 | ARIN | US | 7th Apr 1994 |
| 198.200.203.0/24 | 256 | ARIN | US | 7th Apr 1994 |
| 198.200.206.0/23 | 512 | ARIN | US | 7th Apr 1994 |
| 198.200.209.0/24 | 256 | ARIN | US | 7th Apr 1994 |