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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 203.7.150.0/23 | 512 | APNIC |  CN | 14th Apr 2011 |
| 203.7.153.0/24 | 256 | APNIC |  AU | 24th Aug 1994 |
| 203.7.154.0/24 | 256 | APNIC | AU | 24th Aug 1994 |
| 203.7.158.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.7.169.0/24 | 256 | APNIC | AU | 24th Aug 1994 |
| 203.7.174.0/23 | 512 | ARIN |  CA | 5th Oct 2020 |
| 203.7.192.0/23 | 512 | APNIC | CN | 14th Apr 2011 |
| 203.7.200.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.7.207.0/24 | 256 | APNIC | AU | 25th Aug 1994 |
| 203.7.228.0/22 | 1k | APNIC | AU | 25th Aug 1994 |
| 203.76.160.0/22 | 1k | APNIC | CN | 14th Apr 2011 |
| 203.76.168.0/22 | 1k | APNIC | CN | 14th Apr 2011 |
| 203.76.176.0/24 | 256 | APNIC |  IN | 9th Mar 2004 |
| 203.76.177.0/24 | 256 | APNIC | IN | 9th Mar 2004 |
| 203.76.185.0/24 | 256 | APNIC | IN | 9th Mar 2004 |
| 203.77.180.0/22 | 1k | APNIC | CN | 14th Apr 2011 |
| 203.77.184.0/21 | 2k | APNIC |  JP | 20th Dec 2005 |
| 203.77.96.0/19 | 8.2k | APNIC |  TW | 30th Apr 1999 |
| 203.78.140.0/22 | 1k | APNIC |  HK | 15th Aug 2016 |
| 203.78.156.0/22 | 1k | APNIC | CN | 24th Nov 2015 |
| 203.79.26.0/23 | 512 | APNIC |  ID | 10th Aug 2009 |
| 203.79.28.0/24 | 256 | APNIC |  VN | 13th Aug 2009 |
| 203.8.0.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.8.106.0/24 | 256 | APNIC | AU | 16th Sept 1994 |
| 203.8.11.0/24 | 256 | APNIC | AU | 7th Sept 1994 |
| 203.8.110.0/23 | 512 | APNIC | CN | 14th Apr 2011 |
| 203.8.113.0/24 | 256 | APNIC | AU | 20th Sept 1994 |
| 203.8.115.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.8.12.0/22 | 1k | APNIC | AU | 27th Sept 1995 |
| 203.8.125.0/24 | 256 | APNIC | AU | 23rd Sept 1994 |
| 203.8.16.0/23 | 512 | APNIC | AU | 9th Sept 1994 |
| 203.8.163.0/24 | 256 | APNIC | AU | 5th Mar 1996 |
| 203.8.166.0/23 | 512 | APNIC | CN | 14th Apr 2011 |
| 203.8.168.0/24 | 256 | APNIC | AU | 2nd Oct 1994 |
| 203.8.169.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.8.173.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.8.184.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.8.186.0/23 | 512 | APNIC | CN | 14th Apr 2011 |
| 203.8.190.0/23 | 512 | APNIC | CN | 14th Apr 2011 |
| 203.8.192.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.8.196.0/24 | 256 | APNIC | AU | 7th Oct 1994 |
| 203.8.197.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.8.198.0/23 | 512 | APNIC | CN | 14th Apr 2011 |
| 203.8.203.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.8.204.0/24 | 256 | APNIC | HK | 7th Oct 1994 |
| 203.8.209.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.8.210.0/23 | 512 | APNIC | CN | 14th Apr 2011 |
| 203.8.212.0/22 | 1k | APNIC | CN | 14th Apr 2011 |
| 203.8.217.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.8.220.0/24 | 256 | APNIC | CN | 14th Apr 2011 |