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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
84,783 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 103.17.64.0/22 | 1k | APNIC |  CN | 23rd Jun 2016 |
| 103.17.84.0/22 | 1k | APNIC |  IN | 27th Feb 2013 |
| 103.17.92.0/22 | 1k | APNIC |  HK | 27th Feb 2013 |
| 103.170.110.0/23 | 512 | APNIC | IN | 26th Jul 2021 |
| 103.170.118.0/23 | 512 | APNIC |  VN | 26th Jul 2021 |
| 103.170.12.0/23 | 512 | APNIC | IN | 20th Jul 2021 |
| 103.170.134.0/23 | 512 | APNIC | CN | 27th Jul 2021 |
| 103.170.144.0/23 | 512 | APNIC | IN | 28th Jul 2021 |
| 103.170.150.0/23 | 512 | APNIC | IN | 28th Jul 2021 |
| 103.170.166.0/24 | 256 | APNIC | IN | 28th Jul 2021 |
| 103.170.202.0/23 | 512 | APNIC | IN | 30th Jul 2021 |
| 103.170.220.0/23 | 512 | APNIC | IN | 2nd Aug 2021 |
| 103.170.242.0/23 | 512 | APNIC | IN | 3rd Aug 2021 |
| 103.170.34.0/23 | 512 | APNIC | IN | 22nd Jul 2021 |
| 103.170.44.0/23 | 512 | APNIC | IN | 22nd Jul 2021 |
| 103.170.48.0/23 | 512 | APNIC | IN | 22nd Jul 2021 |
| 103.170.78.0/23 | 512 | APNIC |  BD | 23rd Jul 2021 |
| 103.170.86.0/23 | 512 | APNIC | IN | 23rd Jul 2021 |
| 103.171.102.0/23 | 512 | APNIC | VN | 10th Aug 2021 |
| 103.171.114.0/23 | 512 | APNIC | IN | 11th Aug 2021 |
| 103.171.15.0/24 | 256 | APNIC | IN | 4th Aug 2021 |
| 103.171.170.0/23 | 512 | APNIC | IN | 13th Aug 2021 |
| 103.171.214.0/23 | 512 | APNIC | CN | 17th Aug 2021 |
| 103.171.226.0/23 | 512 | APNIC | IN | 17th Aug 2021 |
| 103.171.32.0/23 | 512 | APNIC | CN | 5th Aug 2021 |
| 103.171.60.0/23 | 512 | APNIC | IN | 8th Aug 2021 |
| 103.171.62.0/23 | 512 | APNIC | IN | 8th Aug 2021 |
| 103.171.86.0/24 | 256 | APNIC | IN | 9th Aug 2021 |
| 103.172.133.0/24 | 256 | APNIC |  AU | 30th Aug 2021 |
| 103.172.160.0/23 | 512 | APNIC | CN | 1st Sept 2021 |
| 103.172.162.0/23 | 512 | APNIC |  JP | 1st Sept 2021 |
| 103.172.176.0/23 | 512 | APNIC |  ID | 2nd Sept 2021 |
| 103.172.194.0/23 | 512 | APNIC | ID | 3rd Sept 2021 |
| 103.172.201.0/24 | 256 | APNIC | IN | 6th Sept 2021 |
| 103.172.206.0/23 | 512 | APNIC | IN | 3rd Sept 2021 |
| 103.172.212.0/23 | 512 | APNIC | IN | 3rd Sept 2021 |
| 103.172.32.0/23 | 512 | APNIC | CN | 23rd Aug 2021 |
| 103.172.51.0/24 | 256 | APNIC | AU | 24th Aug 2021 |
| 103.172.58.0/23 | 512 | APNIC | IN | 24th Aug 2021 |
| 103.172.90.0/23 | 512 | APNIC | IN | 25th Aug 2021 |
| 103.172.96.0/24 | 256 | APNIC | ID | 25th Aug 2021 |
| 103.173.102.0/23 | 512 | APNIC | CN | 17th Sept 2021 |
| 103.173.108.0/23 | 512 | APNIC | IN | 17th Sept 2021 |
| 103.173.117.0/24 | 256 | APNIC | IN | 21st Sept 2021 |
| 103.173.126.0/23 | 512 | APNIC | BD | 21st Sept 2021 |
| 103.173.130.0/23 | 512 | APNIC | IN | 21st Sept 2021 |
| 103.173.156.0/23 | 512 | APNIC | VN | 22nd Sept 2021 |
| 103.173.158.0/23 | 512 | APNIC | VN | 22nd Sept 2021 |
| 103.173.16.0/23 | 512 | APNIC | IN | 9th Sept 2021 |
| 103.173.166.0/24 | 256 | APNIC | ID | 23rd Sept 2021 |