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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 the most unannounced blocks, largest first.
Unannounced blocks
85,493 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 203.33.205.0/24 | 256 | APNIC |  AU | 14th Jul 2010 |
| 203.33.217.0/24 | 256 | APNIC | AU | 25th Oct 1996 |
| 203.33.218.0/23 | 512 | APNIC | AU | 25th Oct 1996 |
| 203.33.226.0/24 | 256 | APNIC |  CN | 14th Apr 2011 |
| 203.33.228.0/23 | 512 | APNIC | AU | 25th Oct 1996 |
| 203.33.232.0/24 | 256 | APNIC | AU | 25th Oct 1996 |
| 203.33.233.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.33.234.0/23 | 512 | APNIC | AU | 25th Oct 1996 |
| 203.33.24.0/24 | 256 | APNIC | AU | 10th Oct 1996 |
| 203.33.242.0/24 | 256 | APNIC | AU | 25th Oct 1996 |
| 203.33.243.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.33.245.0/24 | 256 | APNIC | AU | 25th Oct 1996 |
| 203.33.250.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.33.30.0/24 | 256 | APNIC | AU | 10th Oct 1996 |
| 203.33.35.0/24 | 256 | APNIC |  ID | 10th Oct 1996 |
| 203.33.42.0/24 | 256 | APNIC | AU | 10th Oct 1996 |
| 203.33.68.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.33.69.0/24 | 256 | APNIC | AU | 11th Oct 1996 |
| 203.33.73.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.33.79.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.34.101.0/24 | 256 | APNIC | AU | 12th Nov 1996 |
| 203.34.111.0/24 | 256 | APNIC | AU | 12th Nov 1996 |
| 203.34.116.0/24 | 256 | APNIC |  LK | 30th Nov 2006 |
| 203.34.12.0/23 | 512 | APNIC | AU | 29th Oct 1996 |
| 203.34.141.0/24 | 256 | APNIC | AU | 12th Nov 1996 |
| 203.34.154.0/24 | 256 | APNIC |  MY | 9th Jun 2016 |
| 203.34.160.0/24 | 256 | APNIC |  MM | 13th Nov 1996 |
| 203.34.181.0/24 | 256 | APNIC | AU | 20th Nov 1996 |
| 203.34.187.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.34.2.0/23 | 512 | APNIC | AU | 28th Oct 1996 |
| 203.34.204.0/22 | 1k | APNIC | CN | 14th Apr 2011 |
| 203.34.210.0/24 | 256 | APNIC |  US | 21st Nov 1996 |
| 203.34.237.0/24 | 256 | APNIC |  SG | 22nd Nov 1996 |
| 203.34.243.0/24 | 256 | APNIC | AU | 22nd Nov 1996 |
| 203.34.26.0/24 | 256 | APNIC | AU | 29th Oct 1996 |
| 203.34.33.0/24 | 256 | APNIC | AU | 2nd Sept 1994 |
| 203.34.4.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.34.61.0/24 | 256 | APNIC | AU | 1st Nov 1996 |
| 203.34.64.0/24 | 256 | APNIC | AU | 4th Nov 1996 |
| 203.34.72.0/24 | 256 | APNIC | AU | 6th Nov 1996 |
| 203.34.81.0/24 | 256 | APNIC |  JP | 20th Jun 2005 |
| 203.34.88.0/24 | 256 | APNIC | AU | 6th Nov 1996 |
| 203.4.0.0/17 | 32.8k | APNIC | AU | 28th Jan 1994 |
| 203.4.132.0/23 | 512 | APNIC | CN | 14th Apr 2011 |
| 203.4.134.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.4.151.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.4.152.0/22 | 1k | APNIC | CN | 14th Apr 2011 |
| 203.4.161.0/24 | 256 | APNIC | AU | 7th Apr 1994 |
| 203.4.174.0/23 | 512 | APNIC | CN | 14th Apr 2011 |
| 203.4.176.0/22 | 1k | APNIC | AU | 13th Apr 1994 |