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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
30,441 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 192.149.14.0/24 | 256 | ARIN |  US | 21st Feb 1992 |
| 192.149.146.0/24 | 256 | ARIN | US | 12th Mar 1992 |
| 192.149.148.0/24 | 256 | ARIN | US | 13th Mar 1992 |
| 192.149.151.0/24 | 256 | ARIN | US | 13th Mar 1992 |
| 192.149.152.0/21 | 2k | ARIN | US | 11th Dec 1996 |
| 192.149.160.0/19 | 8.2k | ARIN | US | 11th Dec 1996 |
| 192.149.18.0/24 | 256 | ARIN | US | 24th Feb 1992 |
| 192.149.192.0/21 | 2k | ARIN | US | 11th Dec 1996 |
| 192.149.200.0/23 | 512 | ARIN | US | 11th Dec 1996 |
| 192.149.203.0/24 | 256 | ARIN | US | 17th Mar 1992 |
| 192.149.204.0/24 | 256 | ARIN | US | 17th Mar 1992 |
| 192.149.208.0/24 | 256 | ARIN | US | 17th Mar 1992 |
| 192.149.211.0/24 | 256 | ARIN | US | 17th Mar 1992 |
| 192.149.212.0/24 | 256 | ARIN | US | 17th Mar 1992 |
| 192.149.220.0/24 | 256 | ARIN | US | 17th Mar 1992 |
| 192.149.221.0/24 | 256 | ARIN | US | 17th Mar 1992 |
| 192.149.222.0/24 | 256 | ARIN | US | 17th Mar 1992 |
| 192.149.223.0/24 | 256 | ARIN | US | 19th Mar 1992 |
| 192.149.226.0/24 | 256 | ARIN | US | 23rd Mar 1992 |
| 192.149.228.0/24 | 256 | ARIN | US | 23rd Mar 1992 |
| 192.149.235.0/24 | 256 | ARIN | US | 23rd Mar 1992 |
| 192.149.237.0/24 | 256 | ARIN | US | 24th Mar 1992 |
| 192.149.25.0/24 | 256 | ARIN | US | 24th Feb 1992 |
| 192.149.34.0/24 | 256 | ARIN | US | 26th Feb 1992 |
| 192.149.38.0/24 | 256 | ARIN | US | 27th Feb 1992 |
| 192.149.4.0/24 | 256 | ARIN | US | 21st Feb 1992 |
| 192.149.40.0/24 | 256 | ARIN | US | 26th Feb 1992 |
| 192.149.42.0/24 | 256 | ARIN | US | 26th Feb 1992 |
| 192.149.53.0/24 | 256 | ARIN |  CA | 5th Mar 1992 |
| 192.149.61.0/24 | 256 | ARIN | US | 2nd Mar 1992 |
| 192.149.64.0/23 | 512 | ARIN | US | 19th May 2003 |
| 192.149.66.0/24 | 256 | ARIN | US | 19th May 2003 |
| 192.149.75.0/24 | 256 | ARIN | US | 2nd Mar 1992 |
| 192.149.8.0/24 | 256 | ARIN | US | 14th May 2015 |
| 192.149.80.0/24 | 256 | ARIN | CA | 2nd Mar 1992 |
| 192.149.82.0/24 | 256 | ARIN | US | 3rd Mar 1992 |
| 192.149.85.0/24 | 256 | ARIN | US | 3rd Mar 1992 |
| 192.149.86.0/24 | 256 | ARIN | US | 5th Mar 1992 |
| 192.149.87.0/24 | 256 | ARIN | US | 5th Mar 1992 |
| 192.149.93.0/24 | 256 | ARIN | US | 5th Mar 1992 |
| 192.150.1.0/24 | 256 | ARIN | US | 25th Jun 1992 |
| 192.150.100.0/24 | 256 | ARIN | US | 6th Mar 1992 |
| 192.150.101.0/24 | 256 | ARIN | US | 6th Mar 1992 |
| 192.150.102.0/24 | 256 | ARIN | US | 6th Mar 1992 |
| 192.150.103.0/24 | 256 | ARIN | US | 10th Mar 1992 |
| 192.150.108.0/24 | 256 | ARIN | US | 11th Mar 1992 |
| 192.150.109.0/24 | 256 | ARIN | US | 11th Mar 1992 |
| 192.150.110.0/24 | 256 | ARIN | US | 11th Mar 1992 |
| 192.150.111.0/24 | 256 | ARIN | US | 11th Mar 1992 |
| 192.150.117.0/24 | 256 | ARIN | US | 11th Mar 1992 |