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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
Browse by country
Countries with the most unannounced blocks, largest first.
Unannounced blocks
85,493 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 203.31.72.0/24 | 256 | APNIC |  CN | 14th Apr 2011 |
| 203.31.80.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.31.85.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.31.97.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.32.0.0/22 | 1k | APNIC |  US | 26th Sept 1996 |
| 203.32.102.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.32.105.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.32.122.0/24 | 256 | APNIC |  AU | 1st Oct 1996 |
| 203.32.130.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.32.132.0/24 | 256 | APNIC | AU | 1st Oct 1996 |
| 203.32.133.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.32.136.0/24 | 256 | APNIC | AU | 1st Oct 1996 |
| 203.32.140.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.32.144.0/21 | 2k | APNIC | AU | 2nd Oct 1996 |
| 203.32.152.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.32.159.0/24 | 256 | APNIC | AU | 2nd Oct 1996 |
| 203.32.186.0/23 | 512 | APNIC | CN | 14th Apr 2011 |
| 203.32.190.0/23 | 512 | APNIC |  HK | 2nd Oct 1996 |
| 203.32.192.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.32.196.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.32.20.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.32.21.0/24 | 256 | APNIC | AU | 26th Sept 1996 |
| 203.32.219.0/24 | 256 | APNIC | AU | 10th Oct 1996 |
| 203.32.220.0/24 | 256 | APNIC | AU | 10th Oct 1996 |
| 203.32.26.0/24 | 256 | APNIC | AU | 26th Sept 1996 |
| 203.32.56.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.32.57.0/24 | 256 | APNIC | AU | 26th Sept 1996 |
| 203.32.60.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.32.62.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.32.72.0/23 | 512 | APNIC | AU | 27th Sept 1996 |
| 203.32.76.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.32.81.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.32.95.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.33.100.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.33.107.0/24 | 256 | APNIC | AU | 14th Oct 1996 |
| 203.33.122.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.33.123.0/24 | 256 | APNIC | AU | 15th Oct 1996 |
| 203.33.129.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.33.131.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.33.136.0/22 | 1k | APNIC | AU | 16th Oct 1996 |
| 203.33.142.0/24 | 256 | APNIC | HK | 16th Oct 1996 |
| 203.33.144.0/24 | 256 | APNIC | AU | 16th Oct 1996 |
| 203.33.154.0/24 | 256 | APNIC | AU | 17th Oct 1996 |
| 203.33.176.0/24 | 256 | APNIC | AU | 22nd Oct 1996 |
| 203.33.185.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.33.191.0/24 | 256 | APNIC | AU | 22nd Oct 1996 |
| 203.33.20.0/24 | 256 | APNIC | AU | 10th Oct 1996 |
| 203.33.200.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.33.201.0/24 | 256 | APNIC | AU | 25th Oct 1996 |
| 203.33.204.0/24 | 256 | APNIC | CN | 14th Apr 2011 |