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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
84,818 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 103.186.16.0/23 | 512 | APNIC |  IN | 7th Apr 2022 |
| 103.186.190.0/23 | 512 | APNIC |  TH | 27th Apr 2022 |
| 103.186.2.0/23 | 512 | APNIC |  ID | 6th Apr 2022 |
| 103.186.202.0/23 | 512 | APNIC | ID | 28th Apr 2022 |
| 103.186.228.0/23 | 512 | APNIC |  CN | 29th Apr 2022 |
| 103.186.24.0/23 | 512 | APNIC |  VN | 7th Apr 2022 |
| 103.186.248.0/24 | 256 | APNIC | IN | 4th May 2022 |
| 103.186.42.0/23 | 512 | APNIC | IN | 8th Apr 2022 |
| 103.187.120.0/23 | 512 | APNIC |  AU | 17th May 2022 |
| 103.187.134.0/23 | 512 | APNIC | IN | 17th May 2022 |
| 103.187.142.0/23 | 512 | APNIC | IN | 18th May 2022 |
| 103.187.190.0/23 | 512 | APNIC | IN | 19th May 2022 |
| 103.187.200.0/23 | 512 | APNIC | IN | 19th May 2022 |
| 103.187.224.0/23 | 512 | APNIC | ID | 19th May 2022 |
| 103.187.239.0/24 | 256 | APNIC | AU | 20th May 2022 |
| 103.187.69.0/24 | 256 | APNIC | ID | 11th May 2022 |
| 103.188.118.0/24 | 256 | APNIC | ID | 26th May 2022 |
| 103.188.12.0/24 | 256 | APNIC | ID | 20th May 2022 |
| 103.188.13.0/24 | 256 | APNIC | ID | 20th May 2022 |
| 103.188.179.0/24 | 256 | APNIC | IN | 2nd Jun 2022 |
| 103.188.20.0/23 | 512 | APNIC | VN | 21st May 2022 |
| 103.188.246.0/23 | 512 | APNIC | IN | 2nd Jun 2022 |
| 103.188.90.0/24 | 256 | APNIC |  MM | 26th May 2022 |
| 103.189.108.0/23 | 512 | APNIC |  TW | 9th Jun 2022 |
| 103.189.112.0/23 | 512 | APNIC | ID | 9th Jun 2022 |
| 103.189.136.0/23 | 512 | APNIC | TH | 10th Jun 2022 |
| 103.189.148.0/23 | 512 | APNIC | IN | 13th Jun 2022 |
| 103.189.152.0/23 | 512 | APNIC | CN | 14th Jun 2022 |
| 103.189.204.0/23 | 512 | APNIC | ID | 16th Jun 2022 |
| 103.189.228.0/24 | 256 | APNIC | IN | 20th Jun 2022 |
| 103.189.229.0/24 | 256 | APNIC | ID | 20th Jun 2022 |
| 103.189.3.0/24 | 256 | APNIC | IN | 3rd Jun 2022 |
| 103.189.64.0/23 | 512 | APNIC | ID | 6th Jun 2022 |
| 103.189.8.0/23 | 512 | APNIC | AU | 3rd Jun 2022 |
| 103.189.84.0/23 | 512 | APNIC | IN | 8th Jun 2022 |
| 103.19.12.0/22 | 1k | APNIC | CN | 26th Mar 2013 |
| 103.19.156.0/23 | 512 | APNIC | ID | 14th Oct 2022 |
| 103.19.158.0/23 | 512 | APNIC | ID | 14th Oct 2022 |
| 103.19.184.0/22 | 1k | APNIC | ID | 4th Apr 2013 |
| 103.19.204.0/22 | 1k | APNIC | ID | 5th Apr 2013 |
| 103.19.212.0/22 | 1k | APNIC | IN | 5th Apr 2013 |
| 103.19.240.0/22 | 1k | APNIC |  JP | 8th Apr 2013 |
| 103.19.32.0/22 | 1k | APNIC |  PH | 27th Mar 2013 |
| 103.19.40.0/22 | 1k | APNIC | CN | 27th Mar 2013 |
| 103.19.68.0/22 | 1k | APNIC | CN | 28th Mar 2013 |
| 103.19.72.0/22 | 1k | APNIC | CN | 28th Mar 2013 |
| 103.19.82.0/23 | 512 | APNIC |  SG | 2nd Apr 2013 |
| 103.190.104.0/23 | 512 | APNIC | CN | 1st Jul 2022 |
| 103.190.110.0/24 | 256 | APNIC | ID | 1st Jul 2022 |
| 103.190.116.0/23 | 512 | APNIC | CN | 1st Jul 2022 |