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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 103.173.167.0/24 | 256 | APNIC |  ID | 23rd Sept 2021 |
| 103.173.168.0/23 | 512 | APNIC | ID | 23rd Sept 2021 |
| 103.173.180.0/23 | 512 | APNIC |  JP | 25th Sept 2021 |
| 103.173.182.0/23 | 512 | APNIC |  CN | 25th Sept 2021 |
| 103.173.184.0/23 | 512 | APNIC | CN | 26th Sept 2021 |
| 103.173.188.0/23 | 512 | APNIC |  PH | 27th Sept 2021 |
| 103.173.190.0/24 | 256 | APNIC |  IN | 27th Sept 2021 |
| 103.173.198.0/23 | 512 | APNIC | IN | 27th Sept 2021 |
| 103.173.212.0/23 | 512 | APNIC | JP | 27th Sept 2021 |
| 103.173.238.0/23 | 512 | APNIC | IN | 29th Sept 2021 |
| 103.173.249.0/24 | 256 | APNIC | IN | 30th Sept 2021 |
| 103.173.254.0/23 | 512 | APNIC |  VN | 30th Sept 2021 |
| 103.173.41.0/24 | 256 | APNIC | IN | 14th Sept 2021 |
| 103.173.52.0/23 | 512 | APNIC |  BD | 14th Sept 2021 |
| 103.173.64.0/23 | 512 | APNIC | IN | 15th Sept 2021 |
| 103.173.73.0/24 | 256 | APNIC | ID | 16th Sept 2021 |
| 103.173.8.0/24 | 256 | APNIC | JP | 8th Sept 2021 |
| 103.173.80.0/23 | 512 | APNIC | IN | 16th Sept 2021 |
| 103.174.14.0/23 | 512 | APNIC | ID | 5th Oct 2021 |
| 103.174.146.0/23 | 512 | APNIC |  MY | 13th Oct 2021 |
| 103.174.184.0/24 | 256 | APNIC | ID | 15th Oct 2021 |
| 103.174.218.0/23 | 512 | APNIC | VN | 19th Oct 2021 |
| 103.174.220.0/23 | 512 | APNIC | VN | 19th Oct 2021 |
| 103.174.227.0/24 | 256 | APNIC |  AU | 21st Oct 2021 |
| 103.174.240.0/23 | 512 | APNIC | IN | 21st Oct 2021 |
| 103.174.251.0/24 | 256 | APNIC |  SG | 22nd Oct 2021 |
| 103.174.42.0/23 | 512 | APNIC | IN | 5th Oct 2021 |
| 103.174.66.0/24 | 256 | APNIC | ID | 7th Oct 2021 |
| 103.174.72.0/23 | 512 | APNIC | VN | 7th Oct 2021 |
| 103.174.96.0/23 | 512 | APNIC |  PK | 10th Oct 2021 |
| 103.175.0.0/23 | 512 | APNIC | IN | 22nd Oct 2021 |
| 103.175.104.0/24 | 256 | APNIC | IN | 28th Oct 2021 |
| 103.175.106.0/23 | 512 | APNIC | IN | 28th Oct 2021 |
| 103.175.114.0/23 | 512 | APNIC | CN | 29th Oct 2021 |
| 103.175.118.0/23 | 512 | APNIC | CN | 29th Oct 2021 |
| 103.175.12.0/23 | 512 | APNIC | IN | 22nd Oct 2021 |
| 103.175.148.0/24 | 256 | APNIC |  TL | 2nd Nov 2021 |
| 103.175.150.0/23 | 512 | APNIC | MY | 2nd Nov 2021 |
| 103.175.160.0/23 | 512 | APNIC | ID | 2nd Nov 2021 |
| 103.175.162.0/24 | 256 | APNIC | ID | 2nd Nov 2021 |
| 103.175.205.0/24 | 256 | APNIC | ID | 4th Nov 2021 |
| 103.175.252.0/23 | 512 | APNIC | IN | 8th Nov 2021 |
| 103.175.26.0/23 | 512 | APNIC | SG | 25th Oct 2021 |
| 103.175.38.0/23 | 512 | APNIC | ID | 26th Oct 2021 |
| 103.175.87.0/24 | 256 | APNIC | ID | 27th Oct 2021 |
| 103.176.104.0/23 | 512 | APNIC | ID | 15th Nov 2021 |
| 103.176.114.0/23 | 512 | APNIC | PH | 15th Nov 2021 |
| 103.176.121.0/24 | 256 | APNIC | ID | 16th Nov 2021 |
| 103.176.142.0/24 | 256 | APNIC | IN | 16th Nov 2021 |
| 103.176.164.0/23 | 512 | APNIC | VN | 17th Nov 2021 |