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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 103.164.40.0/23 | 512 | APNIC |  CN | 11th Mar 2021 |
| 103.164.42.0/23 | 512 | APNIC | CN | 11th Mar 2021 |
| 103.164.61.0/24 | 256 | APNIC |  ID | 12th Mar 2021 |
| 103.164.64.0/23 | 512 | APNIC | CN | 15th Mar 2021 |
| 103.164.66.0/24 | 256 | APNIC |  MY | 15th Mar 2021 |
| 103.164.68.0/23 | 512 | APNIC | ID | 15th Mar 2021 |
| 103.164.76.0/23 | 512 | APNIC | CN | 16th Mar 2021 |
| 103.164.82.0/24 | 256 | APNIC |  AU | 16th Mar 2021 |
| 103.164.88.0/24 | 256 | APNIC |  BD | 17th Mar 2021 |
| 103.164.96.0/24 | 256 | APNIC |  JP | 17th Mar 2021 |
| 103.164.97.0/24 | 256 | APNIC | ID | 18th Mar 2021 |
| 103.165.0.0/23 | 512 | APNIC | ID | 25th Mar 2021 |
| 103.165.100.0/23 | 512 | APNIC |  IN | 31st Mar 2021 |
| 103.165.146.0/23 | 512 | APNIC | ID | 5th Apr 2021 |
| 103.165.172.0/23 | 512 | APNIC | IN | 6th Apr 2021 |
| 103.165.178.0/23 | 512 | APNIC |  NZ | 7th Apr 2021 |
| 103.165.188.0/23 | 512 | APNIC | JP | 8th Apr 2021 |
| 103.165.242.0/24 | 256 | APNIC |  US | 9th Apr 2021 |
| 103.165.44.0/23 | 512 | APNIC | CN | 28th Mar 2021 |
| 103.165.52.0/23 | 512 | APNIC | CN | 29th Mar 2021 |
| 103.165.74.0/23 | 512 | APNIC | IN | 30th Mar 2021 |
| 103.165.82.0/23 | 512 | APNIC | CN | 30th Mar 2021 |
| 103.165.91.0/24 | 256 | APNIC | IN | 31st Mar 2021 |
| 103.166.110.0/23 | 512 | APNIC | IN | 21st Apr 2021 |
| 103.166.138.0/23 | 512 | APNIC | CN | 25th Apr 2021 |
| 103.166.176.0/23 | 512 | APNIC |  VN | 28th Apr 2021 |
| 103.166.178.0/24 | 256 | APNIC | ID | 28th Apr 2021 |
| 103.166.180.0/23 | 512 | APNIC | IN | 28th Apr 2021 |
| 103.166.198.0/23 | 512 | APNIC | ID | 29th Apr 2021 |
| 103.166.20.0/23 | 512 | APNIC | CN | 13th Apr 2021 |
| 103.166.202.0/23 | 512 | APNIC |  SG | 30th Apr 2021 |
| 103.166.204.0/23 | 512 | APNIC | IN | 30th Apr 2021 |
| 103.166.218.0/23 | 512 | APNIC | IN | 3rd May 2021 |
| 103.166.220.0/23 | 512 | APNIC | IN | 3rd May 2021 |
| 103.166.225.0/24 | 256 | APNIC | AU | 4th May 2021 |
| 103.166.237.0/24 | 256 | APNIC | JP | 7th May 2021 |
| 103.166.238.0/23 | 512 | APNIC | SG | 5th May 2021 |
| 103.166.31.0/24 | 256 | APNIC |  PH | 14th Apr 2021 |
| 103.166.50.0/23 | 512 | APNIC | CN | 15th Apr 2021 |
| 103.166.52.0/23 | 512 | APNIC | CN | 15th Apr 2021 |
| 103.166.54.0/23 | 512 | APNIC | CN | 15th Apr 2021 |
| 103.166.68.0/23 | 512 | APNIC | IN | 16th Apr 2021 |
| 103.166.84.0/23 | 512 | APNIC | CN | 20th Apr 2021 |
| 103.167.0.0/23 | 512 | APNIC | CN | 10th May 2021 |
| 103.167.100.0/23 | 512 | APNIC | CN | 11th May 2023 |
| 103.167.142.0/23 | 512 | APNIC | ID | 26th May 2021 |
| 103.167.148.0/23 | 512 | APNIC | ID | 26th May 2021 |
| 103.167.196.0/23 | 512 | APNIC | VN | 1st Jun 2021 |
| 103.167.198.0/23 | 512 | APNIC | VN | 1st Jun 2021 |
| 103.167.214.0/23 | 512 | APNIC | MY | 3rd Jun 2021 |