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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
84,778 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 103.140.200.0/23 | 512 | APNIC |  JP | 4th Jul 2019 |
| 103.140.222.0/23 | 512 | APNIC |  AU | 8th Jul 2019 |
| 103.140.230.0/23 | 512 | APNIC |  IN | 8th Jul 2019 |
| 103.140.246.0/23 | 512 | APNIC |  LA | 9th Jul 2019 |
| 103.140.33.0/24 | 256 | APNIC | AU | 18th Jun 2019 |
| 103.140.40.0/23 | 512 | APNIC |  VN | 18th Jun 2019 |
| 103.140.48.0/23 | 512 | APNIC | JP | 19th Jun 2019 |
| 103.140.52.0/24 | 256 | APNIC | IN | 19th Jun 2019 |
| 103.140.58.0/23 | 512 | APNIC | AU | 20th Jun 2019 |
| 103.140.6.0/23 | 512 | APNIC |  MY | 13th Jun 2019 |
| 103.140.66.0/23 | 512 | APNIC |  ID | 20th Jun 2019 |
| 103.140.80.0/23 | 512 | APNIC | ID | 21st Jun 2019 |
| 103.140.84.0/24 | 256 | APNIC | IN | 24th Jun 2019 |
| 103.140.88.0/23 | 512 | APNIC | ID | 24th Jun 2019 |
| 103.140.96.0/24 | 256 | APNIC | ID | 16th Jan 2023 |
| 103.141.128.0/23 | 512 | APNIC |  CN | 24th Jul 2019 |
| 103.141.156.0/23 | 512 | APNIC | ID | 26th Jul 2019 |
| 103.141.162.0/23 | 512 | APNIC | ID | 29th Jul 2019 |
| 103.141.168.0/23 | 512 | APNIC | IN | 29th Jul 2019 |
| 103.141.185.0/24 | 256 | APNIC |  HK | 31st Jul 2019 |
| 103.141.186.0/23 | 512 | APNIC | CN | 31st Jul 2019 |
| 103.141.194.0/23 | 512 | APNIC | ID | 31st Jul 2019 |
| 103.141.213.0/24 | 256 | APNIC | IN | 5th Aug 2019 |
| 103.141.242.0/23 | 512 | APNIC | CN | 8th Aug 2019 |
| 103.141.32.0/24 | 256 | APNIC |  US | 15th Jul 2019 |
| 103.141.40.0/23 | 512 | APNIC | ID | 16th Jul 2019 |
| 103.141.58.0/23 | 512 | APNIC | CN | 18th Jul 2019 |
| 103.141.76.0/24 | 256 | APNIC |  BD | 8th Sept 2023 |
| 103.141.77.0/24 | 256 | APNIC | IN | 22nd Jul 2019 |
| 103.142.122.0/23 | 512 | APNIC | CN | 27th Aug 2019 |
| 103.142.127.0/24 | 256 | APNIC | JP | 27th Aug 2019 |
| 103.142.128.0/23 | 512 | APNIC | CN | 27th Aug 2019 |
| 103.142.154.0/23 | 512 | APNIC | CN | 30th Aug 2019 |
| 103.142.156.0/23 | 512 | APNIC | CN | 30th Aug 2019 |
| 103.142.172.0/23 | 512 | APNIC | CN | 2nd Sept 2019 |
| 103.142.176.0/23 | 512 | APNIC |  TW | 2nd Sept 2019 |
| 103.142.180.0/23 | 512 | APNIC | CN | 2nd Sept 2019 |
| 103.142.182.0/23 | 512 | APNIC | ID | 2nd Sept 2019 |
| 103.142.186.0/23 | 512 | APNIC | CN | 3rd Sept 2019 |
| 103.142.192.0/23 | 512 | APNIC | BD | 4th Sept 2019 |
| 103.142.20.0/24 | 256 | APNIC | ID | 11th Sept 2023 |
| 103.142.204.0/23 | 512 | APNIC | US | 4th Sept 2019 |
| 103.142.206.0/23 | 512 | APNIC | ID | 5th Sept 2019 |
| 103.142.232.0/23 | 512 | APNIC |  SC | 9th Sept 2019 |
| 103.142.238.0/23 | 512 | APNIC | CN | 10th Sept 2019 |
| 103.142.28.0/23 | 512 | APNIC | CN | 15th Aug 2019 |
| 103.142.46.0/23 | 512 | APNIC | HK | 16th Aug 2019 |
| 103.142.51.0/24 | 256 | APNIC | AU | 19th Aug 2019 |
| 103.142.53.0/24 | 256 | APNIC | IN | 19th Aug 2019 |
| 103.142.58.0/23 | 512 | APNIC | CN | 19th Aug 2019 |