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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,536 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 203.1.108.0/24 | 256 | APNIC |  CN | 14th Apr 2011 |
| 203.1.128.0/18 | 16.4k | APNIC |  AU | 5th Nov 1993 |
| 203.1.18.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.1.222.0/24 | 256 | APNIC | AU | 24th Feb 2010 |
| 203.1.223.0/24 | 256 | APNIC | AU | 24th Feb 2010 |
| 203.1.24.0/24 | 256 | APNIC | AU | 13th Oct 1993 |
| 203.1.248.0/22 | 1k | APNIC | AU | 13th Dec 1993 |
| 203.1.25.0/24 | 256 | APNIC |  ID | 11th Feb 2011 |
| 203.1.253.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.1.254.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.1.26.0/23 | 512 | APNIC | CN | 14th Apr 2011 |
| 203.1.29.0/24 | 256 | APNIC | AU | 13th Oct 1993 |
| 203.1.3.0/24 | 256 | APNIC | AU | 29th Nov 1993 |
| 203.1.30.0/24 | 256 | APNIC | AU | 13th Oct 1993 |
| 203.1.4.0/22 | 1k | APNIC | CN | 14th Apr 2011 |
| 203.1.65.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.1.66.0/23 | 512 | APNIC | CN | 14th Apr 2011 |
| 203.1.70.0/23 | 512 | APNIC | CN | 14th Apr 2011 |
| 203.1.76.0/23 | 512 | APNIC | CN | 14th Apr 2011 |
| 203.1.90.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.1.97.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.1.98.0/23 | 512 | APNIC | CN | 14th Apr 2011 |
| 203.10.104.0/24 | 256 | APNIC | AU | 22nd Dec 1994 |
| 203.10.106.0/24 | 256 | APNIC | AU | 22nd Dec 1994 |
| 203.10.107.0/24 | 256 | APNIC | AU | 9th Oct 1995 |
| 203.10.111.0/24 | 256 | APNIC | AU | 23rd Dec 1994 |
| 203.10.125.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.10.32.0/24 | 256 | APNIC | AU | 18th Nov 1994 |
| 203.10.33.0/24 | 256 | APNIC | AU | 18th Nov 1994 |
| 203.10.34.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.10.56.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.10.74.0/23 | 512 | APNIC | CN | 14th Apr 2011 |
| 203.10.78.0/24 | 256 | APNIC | AU | 14th Dec 1994 |
| 203.10.84.0/22 | 1k | APNIC | CN | 14th Apr 2011 |
| 203.10.88.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.10.92.0/24 | 256 | APNIC | AU | 15th Dec 1994 |
| 203.10.93.0/24 | 256 | APNIC | AU | 21st Dec 1994 |
| 203.10.94.0/24 | 256 | APNIC | AU | 21st Dec 1994 |
| 203.10.95.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.100.32.0/20 | 4.1k | APNIC | CN | 27th May 2004 |
| 203.100.58.0/24 | 256 | APNIC | CN | 9th Jun 2016 |
| 203.100.60.0/24 | 256 | APNIC | CN | 9th Jun 2016 |
| 203.100.63.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.100.96.0/19 | 8.2k | APNIC | CN | 12th Jan 2005 |
| 203.101.192.0/19 | 8.2k | APNIC |  SG | 27th Jan 2005 |
| 203.105.128.0/19 | 8.2k | APNIC | CN | 12th Apr 2011 |
| 203.105.96.0/19 | 8.2k | APNIC | CN | 12th Apr 2011 |
| 203.109.48.0/22 | 1k | APNIC |  MM | 15th May 2019 |
| 203.11.100.0/22 | 1k | APNIC | CN | 14th Apr 2011 |
| 203.11.104.0/22 | 1k | APNIC | AU | 12th Jan 1995 |