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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
84,906 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 103.207.232.0/22 | 1k | APNIC |  CN | 29th Jan 2016 |
| 103.207.240.0/22 | 1k | APNIC |  IN | 29th Jan 2016 |
| 103.207.252.0/22 | 1k | APNIC |  TW | 29th Jan 2016 |
| 103.207.30.0/23 | 512 | APNIC |  AU | 22nd Jan 2016 |
| 103.207.78.0/23 | 512 | APNIC |  NZ | 25th Jan 2016 |
| 103.207.90.0/23 | 512 | APNIC | IN | 22nd May 2023 |
| 103.207.92.0/24 | 256 | APNIC | AU | 25th Jan 2016 |
| 103.207.93.0/24 | 256 | APNIC |  HK | 3rd Feb 2016 |
| 103.208.112.0/22 | 1k | APNIC | IN | 3rd Feb 2016 |
| 103.208.116.0/22 | 1k | APNIC | IN | 3rd Feb 2016 |
| 103.208.120.0/22 | 1k | APNIC | IN | 3rd Feb 2016 |
| 103.208.124.0/22 | 1k | APNIC | IN | 3rd Feb 2016 |
| 103.208.128.0/22 | 1k | APNIC | IN | 3rd Feb 2016 |
| 103.208.16.0/22 | 1k | APNIC | CN | 1st Feb 2016 |
| 103.208.160.0/22 | 1k | APNIC |  ID | 5th Feb 2016 |
| 103.208.23.0/24 | 256 | APNIC | ID | 4th Feb 2016 |
| 103.208.28.0/22 | 1k | APNIC | CN | 1st Feb 2016 |
| 103.208.40.0/22 | 1k | APNIC | CN | 2nd Feb 2016 |
| 103.208.44.0/22 | 1k | APNIC | CN | 2nd Feb 2016 |
| 103.208.76.0/22 | 1k | APNIC | IN | 2nd Feb 2016 |
| 103.208.92.0/23 | 512 | APNIC | AU | 3rd Feb 2016 |
| 103.209.0.0/24 | 256 | APNIC |  SG | 11th Feb 2016 |
| 103.209.120.0/22 | 1k | APNIC | SG | 18th Feb 2016 |
| 103.209.134.0/24 | 256 | APNIC | IN | 25th May 2023 |
| 103.209.148.0/22 | 1k | APNIC |  JP | 19th Feb 2016 |
| 103.209.162.0/23 | 512 | APNIC | AU | 19th Feb 2016 |
| 103.209.164.0/22 | 1k | RIPE NCC |  GB | 19th Feb 2016 |
| 103.209.188.0/23 | 512 | APNIC |  VN | 31st May 2023 |
| 103.209.192.0/22 | 1k | APNIC | NZ | 22nd Feb 2016 |
| 103.209.200.0/22 | 1k | APNIC | CN | 22nd Feb 2016 |
| 103.209.208.0/22 | 1k | APNIC | CN | 22nd Feb 2016 |
| 103.209.216.0/22 | 1k | APNIC | CN | 22nd Feb 2016 |
| 103.209.236.0/22 | 1k | APNIC | JP | 23rd Feb 2016 |
| 103.209.240.0/24 | 256 | APNIC | IN | 23rd Feb 2016 |
| 103.209.27.0/24 | 256 | APNIC | IN | 15th Feb 2016 |
| 103.209.28.0/22 | 1k | APNIC | HK | 12th Feb 2016 |
| 103.209.72.0/23 | 512 | APNIC | IN | 23rd May 2023 |
| 103.209.95.0/24 | 256 | APNIC | ID | 17th Feb 2016 |
| 103.209.99.0/24 | 256 | APNIC | IN | 17th Feb 2016 |
| 103.21.102.0/23 | 512 | APNIC | CN | 25th Aug 2023 |
| 103.21.104.0/22 | 1k | APNIC | JP | 9th Oct 2012 |
| 103.21.112.0/22 | 1k | APNIC | CN | 10th Oct 2012 |
| 103.21.16.0/24 | 256 | APNIC | IN | 28th Sept 2012 |
| 103.21.212.0/22 | 1k | APNIC | ID | 18th Oct 2012 |
| 103.21.224.0/22 | 1k | APNIC | ID | 22nd Oct 2012 |
| 103.21.36.0/22 | 1k | APNIC | JP | 2nd Oct 2012 |
| 103.21.44.0/22 | 1k | APNIC |  MY | 3rd Oct 2012 |
| 103.21.66.0/24 | 256 | APNIC | IN | 8th Oct 2012 |
| 103.21.72.0/22 | 1k | APNIC |  BD | 8th Oct 2012 |
| 103.21.98.0/23 | 512 | APNIC | CN | 25th Aug 2023 |