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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,493 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 203.89.144.0/24 | 256 | APNIC |  CN | 9th Jun 2016 |
| 203.89.146.0/23 | 512 | APNIC |  ID | 17th Apr 2009 |
| 203.89.148.0/23 | 512 | APNIC | ID | 20th Apr 2009 |
| 203.89.156.0/22 | 1k | APNIC |  AU | 3rd Aug 2010 |
| 203.89.16.0/21 | 2k | APNIC | ID | 27th Jan 2006 |
| 203.9.0.0/19 | 8.2k | APNIC | AU | 7th Oct 1994 |
| 203.9.100.0/23 | 512 | APNIC | CN | 14th Apr 2011 |
| 203.9.106.0/24 | 256 | APNIC | AU | 27th Oct 1994 |
| 203.9.107.0/24 | 256 | APNIC | AU | 27th Oct 1994 |
| 203.9.108.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.9.128.0/21 | 2k | APNIC | AU | 27th Oct 1994 |
| 203.9.144.0/22 | 1k | APNIC | AU | 27th Oct 1994 |
| 203.9.148.0/24 | 256 | APNIC | AU | 1st Nov 1994 |
| 203.9.158.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.9.198.0/23 | 512 | APNIC |  NZ | 5th Aug 2025 |
| 203.9.209.0/24 | 256 | APNIC | AU | 7th Nov 1994 |
| 203.9.212.0/23 | 512 | APNIC |  IN | 5th Aug 2025 |
| 203.9.32.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.9.36.0/23 | 512 | APNIC | CN | 14th Apr 2011 |
| 203.9.57.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.9.59.0/24 | 256 | APNIC | AU | 25th Jul 1995 |
| 203.9.62.0/24 | 256 | APNIC | AU | 31st Mar 2011 |
| 203.9.63.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.9.64.0/24 | 256 | APNIC | AU | 21st Oct 1994 |
| 203.9.65.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.9.66.0/24 | 256 | APNIC | AU | 21st Oct 1994 |
| 203.9.67.0/24 | 256 | APNIC | AU | 21st Oct 1994 |
| 203.9.70.0/23 | 512 | APNIC | CN | 14th Apr 2011 |
| 203.9.72.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.9.73.0/24 | 256 | APNIC | AU | 25th Oct 1994 |
| 203.9.75.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.9.76.0/23 | 512 | APNIC | CN | 14th Apr 2011 |
| 203.9.96.0/22 | 1k | APNIC | CN | 14th Apr 2011 |
| 203.90.12.0/22 | 1k | APNIC | CN | 29th Oct 2015 |
| 203.90.8.0/22 | 1k | APNIC | CN | 14th Apr 2011 |
| 203.91.0.0/19 | 8.2k | APNIC |  TW | 12th May 2005 |
| 203.91.96.0/20 | 4.1k | APNIC | CN | 9th Jun 2004 |
| 203.92.0.0/22 | 1k | APNIC | CN | 14th Apr 2011 |
| 203.92.160.0/19 | 8.2k | APNIC | CN | 17th May 2004 |
| 203.92.6.0/24 | 256 | APNIC | CN | 9th Jun 2016 |
| 203.94.128.0/22 | 1k | APNIC | AU | 26th May 2000 |
| 203.94.132.0/22 | 1k | APNIC | AU | 7th Jun 2000 |
| 203.94.136.0/21 | 2k | APNIC | AU | 7th Jun 2000 |
| 203.94.144.0/20 | 4.1k | APNIC | AU | 7th Jun 2000 |
| 203.94.160.0/20 | 4.1k | APNIC | AU | 18th Jun 2001 |
| 203.94.176.0/20 | 4.1k | APNIC | AU | 25th Oct 2001 |
| 203.95.112.0/20 | 4.1k | APNIC | CN | 16th Jun 2006 |
| 203.95.16.0/21 | 2k | APNIC |  JP | 23rd Mar 2006 |
| 203.95.200.0/22 | 1k | APNIC | CN | 25th Dec 2015 |
| 203.95.204.0/22 | 1k | APNIC | CN | 25th Dec 2015 |