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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 in United States
26,955 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 192.5.33.0/24 | 256 | ARIN | 3rd Jul 1983 | |
| 192.5.34.0/24 | 256 | ARIN | 3rd Jul 1983 | |
| 192.5.35.0/24 | 256 | ARIN | 19th Apr 1990 | |
| 192.5.37.0/24 | 256 | ARIN | 23rd Apr 1990 | |
| 192.5.39.0/24 | 256 | ARIN | 1st Nov 1989 | |
| 192.5.45.0/24 | 256 | ARIN | 26th Mar 1990 | |
| 192.5.52.0/24 | 256 | ARIN | 13th Feb 1984 | |
| 192.5.54.0/24 | 256 | ARIN | 27th Feb 1984 | |
| 192.5.55.0/24 | 256 | ARIN | 26th Mar 1990 | |
| 192.5.56.0/24 | 256 | ARIN | 30th May 1984 | |
| 192.5.57.0/24 | 256 | ARIN | 12th Feb 2014 | |
| 192.5.64.0/24 | 256 | ARIN | 13th Apr 1984 | |
| 192.5.68.0/23 | 512 | ARIN | 17th Jun 2021 | |
| 192.5.70.0/24 | 256 | ARIN | 1st Jun 1984 | |
| 192.5.72.0/24 | 256 | ARIN | 1st Nov 1989 | |
| 192.5.73.0/24 | 256 | ARIN | 28th Sept 2017 | |
| 192.5.74.0/23 | 512 | ARIN | 20th May 1988 | |
| 192.5.76.0/22 | 1k | ARIN | 20th May 1988 | |
| 192.5.80.0/23 | 512 | ARIN | 20th May 1988 | |
| 192.5.82.0/24 | 256 | ARIN | 25th May 1988 | |
| 192.5.83.0/24 | 256 | ARIN | 23rd May 1988 | |
| 192.5.88.0/24 | 256 | ARIN | 25th Feb 1991 | |
| 192.5.89.0/24 | 256 | ARIN | 16th Sept 1985 | |
| 192.5.9.0/24 | 256 | ARIN | 19th Jan 1983 | |
| 192.5.94.0/24 | 256 | ARIN | 10th Jul 1984 | |
| 192.5.95.0/24 | 256 | ARIN | 10th Jul 1984 | |
| 192.52.100.0/24 | 256 | ARIN | 7th Apr 1989 | |
| 192.52.101.0/24 | 256 | ARIN | 7th Apr 1989 | |
| 192.52.102.0/24 | 256 | ARIN | 7th Apr 1989 | |
| 192.52.103.0/24 | 256 | ARIN | 7th Apr 1989 | |
| 192.52.104.0/24 | 256 | ARIN | 7th Apr 1989 | |
| 192.52.105.0/24 | 256 | ARIN | 7th Apr 1989 | |
| 192.52.107.0/24 | 256 | ARIN | 11th Apr 1989 | |
| 192.52.110.0/24 | 256 | ARIN | 14th Apr 1989 | |
| 192.52.113.0/24 | 256 | ARIN | 14th Apr 1989 | |
| 192.52.116.0/24 | 256 | ARIN | 14th Apr 1989 | |
| 192.52.118.0/24 | 256 | ARIN | 1st Oct 2014 | |
| 192.52.151.0/24 | 256 | ARIN | 19th Apr 1989 | |
| 192.52.153.0/24 | 256 | ARIN | 20th Apr 1989 | |
| 192.52.154.0/24 | 256 | ARIN | 20th Apr 1989 | |
| 192.52.157.0/24 | 256 | ARIN | 21st Apr 1989 | |
| 192.52.170.0/24 | 256 | ARIN | 25th Apr 1989 | |
| 192.52.180.0/24 | 256 | ARIN | 27th Apr 1989 | |
| 192.52.181.0/24 | 256 | ARIN | 27th Apr 1989 | |
| 192.52.182.0/24 | 256 | ARIN | 27th Apr 1989 | |
| 192.52.184.0/24 | 256 | ARIN | 3rd May 1989 | |
| 192.52.186.0/24 | 256 | ARIN | 3rd May 1989 | |
| 192.52.187.0/24 | 256 | ARIN | 4th May 1989 | |
| 192.52.195.0/24 | 256 | ARIN | 8th May 1989 | |
| 192.52.218.0/24 | 256 | ARIN | 10th May 1989 |