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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
84,778 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 103.150.200.0/23 | 512 | APNIC |  CN | 23rd Apr 2020 |
| 103.150.216.0/23 | 512 | APNIC | CN | 24th Apr 2020 |
| 103.150.233.0/24 | 256 | APNIC |  AU | 29th Apr 2020 |
| 103.150.244.0/23 | 512 | APNIC | CN | 29th Apr 2020 |
| 103.150.28.0/24 | 256 | APNIC |  HK | 3rd Apr 2020 |
| 103.150.39.0/24 | 256 | APNIC | AU | 7th Apr 2020 |
| 103.150.58.0/24 | 256 | APNIC |  MM | 8th Apr 2020 |
| 103.150.59.0/24 | 256 | APNIC | AU | 9th Apr 2020 |
| 103.150.66.0/23 | 512 | APNIC | CN | 9th Apr 2020 |
| 103.150.72.0/23 | 512 | APNIC | CN | 10th Apr 2020 |
| 103.151.10.0/23 | 512 | APNIC |  BD | 1st May 2020 |
| 103.151.142.0/23 | 512 | APNIC | CN | 20th May 2020 |
| 103.151.158.0/23 | 512 | APNIC | CN | 21st May 2020 |
| 103.151.160.0/23 | 512 | APNIC | HK | 22nd May 2020 |
| 103.151.164.0/23 | 512 | APNIC |  ID | 22nd May 2020 |
| 103.151.168.0/23 | 512 | APNIC | BD | 24th May 2020 |
| 103.151.175.0/24 | 256 | APNIC | AU | 26th May 2020 |
| 103.151.176.0/24 | 256 | APNIC |  SG | 26th May 2020 |
| 103.151.196.0/23 | 512 | APNIC | BD | 29th May 2020 |
| 103.151.2.0/23 | 512 | APNIC |  MY | 30th Apr 2020 |
| 103.151.200.0/24 | 256 | APNIC | HK | 31st May 2020 |
| 103.151.206.0/23 | 512 | APNIC | HK | 1st Jun 2020 |
| 103.151.211.0/24 | 256 | APNIC | ID | 2nd Jun 2020 |
| 103.151.232.0/23 | 512 | APNIC |  IN | 3rd Jun 2020 |
| 103.151.39.0/24 | 256 | APNIC | AU | 6th May 2020 |
| 103.151.68.0/23 | 512 | APNIC |  TH | 10th May 2020 |
| 103.151.72.0/23 | 512 | APNIC | ID | 11th May 2020 |
| 103.151.82.0/24 | 256 | APNIC | IN | 13th May 2020 |
| 103.152.10.0/23 | 512 | APNIC | BD | 9th Jun 2020 |
| 103.152.120.0/23 | 512 | APNIC | CN | 22nd Jun 2020 |
| 103.152.122.0/23 | 512 | APNIC | CN | 22nd Jun 2020 |
| 103.152.126.0/23 | 512 | APNIC |  US | 23rd Jun 2020 |
| 103.152.130.0/23 | 512 | APNIC |  JP | 23rd Jun 2020 |
| 103.152.146.0/24 | 256 | APNIC | ID | 24th Jun 2020 |
| 103.152.152.0/23 | 512 | APNIC | CN | 24th Jun 2020 |
| 103.152.160.0/23 | 512 | APNIC |  VN | 25th Jun 2020 |
| 103.152.168.0/23 | 512 | APNIC | CN | 28th Jun 2020 |
| 103.152.190.0/23 | 512 | APNIC | HK | 30th Jun 2020 |
| 103.152.192.0/23 | 512 | APNIC | CN | 30th Jun 2020 |
| 103.152.200.0/23 | 512 | APNIC | CN | 30th Jun 2020 |
| 103.152.210.0/23 | 512 | APNIC | HK | 1st Jul 2020 |
| 103.152.23.0/24 | 256 | APNIC | ID | 10th Jun 2020 |
| 103.152.250.0/23 | 512 | APNIC | CN | 6th Jul 2020 |
| 103.152.30.0/23 | 512 | APNIC | CN | 11th Jun 2020 |
| 103.152.44.0/24 | 256 | APNIC | IN | 15th Jun 2020 |
| 103.152.46.0/23 | 512 | APNIC | VN | 15th Jun 2020 |
| 103.152.82.0/23 | 512 | APNIC | HK | 19th Jun 2020 |
| 103.152.94.0/23 | 512 | APNIC | ID | 19th Jun 2020 |
| 103.153.109.0/24 | 256 | APNIC | AU | 17th Jul 2020 |
| 103.153.114.0/23 | 512 | APNIC | CN | 17th Jul 2020 |