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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
84,960 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 103.9.152.0/22 | 1k | APNIC |  CN | 17th May 2012 |
| 103.9.172.0/22 | 1k | APNIC |  JP | 18th May 2012 |
| 103.9.180.0/24 | 256 | APNIC | JP | 28th May 2012 |
| 103.9.181.0/24 | 256 | APNIC |  BD | 28th May 2012 |
| 103.9.24.0/22 | 1k | APNIC | CN | 29th Oct 2015 |
| 103.9.248.0/22 | 1k | APNIC | CN | 20th Jun 2012 |
| 103.9.44.0/22 | 1k | APNIC |  ID | 9th May 2012 |
| 103.9.72.0/22 | 1k | APNIC |  IN | 10th May 2012 |
| 103.9.80.0/22 | 1k | APNIC |  VN | 10th May 2012 |
| 103.90.100.0/22 | 1k | APNIC | CN | 13th Apr 2017 |
| 103.90.104.0/22 | 1k | APNIC | CN | 13th Apr 2017 |
| 103.90.108.0/22 | 1k | APNIC | CN | 13th Apr 2017 |
| 103.90.112.0/22 | 1k | APNIC | CN | 13th Apr 2017 |
| 103.90.116.0/22 | 1k | APNIC | CN | 13th Apr 2017 |
| 103.90.120.0/22 | 1k | APNIC | CN | 13th Apr 2017 |
| 103.90.124.0/22 | 1k | APNIC | CN | 13th Apr 2017 |
| 103.90.128.0/22 | 1k | APNIC | CN | 13th Apr 2017 |
| 103.90.132.0/22 | 1k | APNIC | CN | 13th Apr 2017 |
| 103.90.14.0/24 | 256 | APNIC |  NZ | 10th Apr 2017 |
| 103.90.15.0/24 | 256 | APNIC | ID | 7th Nov 2022 |
| 103.90.168.0/22 | 1k | APNIC | CN | 14th Apr 2017 |
| 103.90.172.0/24 | 256 | APNIC |  HK | 14th Apr 2017 |
| 103.90.192.0/22 | 1k | APNIC | CN | 18th Apr 2017 |
| 103.90.20.0/22 | 1k | APNIC |  AU | 10th Apr 2017 |
| 103.90.252.0/24 | 256 | APNIC | ID | 20th Apr 2017 |
| 103.90.40.0/22 | 1k | APNIC |  TH | 10th Apr 2017 |
| 103.90.52.0/22 | 1k | APNIC | CN | 11th Apr 2017 |
| 103.90.60.0/23 | 512 | APNIC | ID | 20th Feb 2023 |
| 103.90.65.0/24 | 256 | APNIC | AU | 12th Apr 2017 |
| 103.90.77.0/24 | 256 | APNIC | ID | 7th Nov 2022 |
| 103.90.8.0/22 | 1k | APNIC | ID | 7th Apr 2017 |
| 103.91.100.0/22 | 1k | APNIC | IN | 25th Apr 2017 |
| 103.91.108.0/22 | 1k | APNIC | CN | 26th Apr 2017 |
| 103.91.112.0/23 | 512 | APNIC | CN | 4th Aug 2022 |
| 103.91.12.0/23 | 512 | APNIC | ID | 21st Apr 2017 |
| 103.91.124.0/24 | 256 | APNIC | IN | 26th Apr 2017 |
| 103.91.127.0/24 | 256 | APNIC | IN | 28th Apr 2017 |
| 103.91.136.0/24 | 256 | APNIC | IN | 26th Apr 2017 |
| 103.91.138.0/23 | 512 | APNIC | CN | 4th Aug 2022 |
| 103.91.152.0/22 | 1k | APNIC | CN | 27th Apr 2017 |
| 103.91.200.0/22 | 1k | APNIC | CN | 2nd May 2017 |
| 103.91.212.0/22 | 1k | APNIC | CN | 3rd May 2017 |
| 103.91.236.0/22 | 1k | APNIC | CN | 4th May 2017 |
| 103.91.252.0/22 | 1k | APNIC | CN | 4th May 2017 |
| 103.91.36.0/22 | 1k | APNIC | CN | 21st Apr 2017 |
| 103.91.40.0/22 | 1k | APNIC | CN | 21st Apr 2017 |
| 103.91.55.0/24 | 256 | APNIC | ID | 7th Nov 2022 |
| 103.91.63.0/24 | 256 | APNIC | IN | 24th Apr 2017 |
| 103.92.0.0/22 | 1k | APNIC | CN | 4th May 2017 |
| 103.92.104.0/24 | 256 | APNIC | ID | 8th May 2017 |