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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,578 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 203.19.101.0/24 | 256 | APNIC |  CN | 14th Apr 2011 |
| 203.19.102.0/24 | 256 | APNIC |  AU | 31st Aug 1995 |
| 203.19.111.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.19.120.0/21 | 2k | APNIC | AU | 5th Sept 1995 |
| 203.19.130.0/24 | 256 | APNIC | AU | 6th Sept 1995 |
| 203.19.131.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.19.133.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.19.134.0/23 | 512 | APNIC | AU | 7th Sept 1995 |
| 203.19.144.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.19.147.0/24 | 256 | APNIC | CN | 9th Jun 2016 |
| 203.19.149.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.19.15.0/24 | 256 | APNIC | AU | 21st Aug 1995 |
| 203.19.150.0/24 | 256 | APNIC | AU | 11th Sept 1995 |
| 203.19.152.0/22 | 1k | APNIC | AU | 11th Sept 1995 |
| 203.19.156.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.19.159.0/24 | 256 | APNIC | AU | 11th Sept 1995 |
| 203.19.160.0/22 | 1k | APNIC | AU | 11th Sept 1995 |
| 203.19.176.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.19.178.0/23 | 512 | APNIC | CN | 14th Apr 2011 |
| 203.19.18.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.19.184.0/22 | 1k | APNIC | AU | 12th Sept 1995 |
| 203.19.188.0/23 | 512 | APNIC | AU | 12th Sept 1995 |
| 203.19.192.0/20 | 4.1k | APNIC | AU | 12th Sept 1995 |
| 203.19.208.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.19.22.0/23 | 512 | APNIC | AU | 21st Aug 1995 |
| 203.19.228.0/22 | 1k | APNIC | CN | 14th Apr 2011 |
| 203.19.233.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.19.24.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.19.242.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.19.248.0/23 | 512 | APNIC | CN | 14th Apr 2011 |
| 203.19.25.0/24 | 256 | APNIC | AU | 21st Aug 1995 |
| 203.19.251.0/24 | 256 | APNIC | AU | 20th Sept 1995 |
| 203.19.254.0/24 | 256 | APNIC | AU | 21st Sept 1995 |
| 203.19.255.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.19.30.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.19.4.0/24 | 256 | APNIC |  ID | 13th May 2009 |
| 203.19.41.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.19.44.0/23 | 512 | APNIC | CN | 14th Apr 2011 |
| 203.19.46.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.19.49.0/24 | 256 | APNIC | AU | 23rd Aug 1995 |
| 203.19.58.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.19.60.0/23 | 512 | APNIC | CN | 14th Apr 2011 |
| 203.19.64.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.19.66.0/24 | 256 | APNIC | AU | 29th Jul 2010 |
| 203.19.68.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.19.72.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.19.73.0/24 | 256 | APNIC | AU | 30th Aug 1995 |
| 203.19.75.0/24 | 256 | APNIC | AU | 31st Aug 1995 |
| 203.19.78.0/24 | 256 | APNIC | AU | 31st Aug 1995 |
| 203.19.79.0/24 | 256 | APNIC | AU | 31st Aug 1995 |