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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 in Taiwan
321 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 103.224.204.0/22 | 1k | APNIC |  TW | 24th Jan 2014 |
| 103.23.108.0/23 | 512 | APNIC | TW | 22nd Nov 2011 |
| 103.23.110.0/23 | 512 | APNIC | TW | 22nd Nov 2011 |
| 103.237.48.0/23 | 512 | APNIC | TW | 11th Jul 2023 |
| 103.239.60.0/22 | 1k | APNIC | TW | 31st Jul 2014 |
| 103.241.68.0/22 | 1k | APNIC | TW | 27th Aug 2013 |
| 103.243.248.0/22 | 1k | APNIC | TW | 21st Oct 2013 |
| 103.25.236.0/22 | 1k | APNIC | TW | 9th May 2013 |
| 103.255.206.0/23 | 512 | APNIC | TW | 22nd Aug 2023 |
| 103.255.42.0/23 | 512 | APNIC | TW | 18th Aug 2023 |
| 103.36.24.0/23 | 512 | APNIC | TW | 8th Nov 2022 |
| 103.37.36.0/22 | 1k | APNIC | TW | 19th Aug 2014 |
| 103.38.146.0/23 | 512 | APNIC | TW | 8th Sept 2014 |
| 103.42.112.0/23 | 512 | APNIC | TW | 5th Nov 2014 |
| 103.5.32.0/22 | 1k | APNIC | TW | 8th Sept 2011 |
| 103.51.90.0/23 | 512 | APNIC | TW | 8th Dec 2022 |
| 103.6.126.0/23 | 512 | APNIC | TW | 23rd Aug 2023 |
| 103.67.72.0/23 | 512 | APNIC | TW | 20th Oct 2023 |
| 103.69.92.0/23 | 512 | APNIC | TW | 28th Apr 2023 |
| 103.71.140.0/22 | 1k | APNIC | TW | 11th Aug 2016 |
| 110.50.128.0/18 | 16.4k | APNIC | TW | 23rd Mar 2009 |
| 112.78.64.0/19 | 8.2k | APNIC | TW | 6th Jan 2009 |
| 113.212.78.0/23 | 512 | APNIC | TW | 27th Jun 2019 |
| 115.42.80.0/20 | 4.1k | APNIC | TW | 9th Mar 2011 |
| 115.80.0.0/14 | 262k | APNIC | TW | 22nd Jul 2008 |
| 116.212.80.0/20 | 4.1k | APNIC | TW | 24th Apr 2007 |
| 116.214.0.0/20 | 4.1k | APNIC | TW | 30th Apr 2007 |
| 116.89.128.0/20 | 4.1k | APNIC | TW | 21st May 2007 |
| 117.19.0.0/16 | 65.5k | APNIC | TW | 12th Jun 2007 |
| 119.160.240.0/20 | 4.1k | APNIC | TW | 27th Feb 2008 |
| 122.128.80.0/21 | 2k | APNIC | TW | 15th Dec 2006 |
| 122.252.160.0/20 | 4.1k | APNIC | TW | 15th Nov 2006 |
| 123.99.0.0/19 | 8.2k | APNIC | TW | 28th Sept 2006 |
| 123.99.32.0/19 | 8.2k | APNIC | TW | 25th Jan 2007 |
| 138.252.116.0/23 | 512 | APNIC | TW | 30th Oct 2025 |
| 150.129.96.0/22 | 1k | APNIC | TW | 26th Jun 2014 |
| 151.158.160.0/23 | 512 | APNIC | TW | 10th Feb 2026 |
| 160.19.90.0/23 | 512 | APNIC | TW | 14th May 2024 |
| 160.236.254.0/23 | 512 | APNIC | TW | 10th Aug 2026 |
| 162.4.120.0/23 | 512 | APNIC | TW | 13th May 2026 |
| 162.4.92.0/24 | 256 | APNIC | TW | 7th May 2026 |
| 163.128.120.0/23 | 512 | APNIC | TW | 27th Mar 2026 |
| 163.223.248.0/23 | 512 | APNIC | TW | 7th Apr 2025 |
| 165.99.170.0/23 | 512 | APNIC | TW | 29th May 2025 |
| 175.111.32.0/19 | 8.2k | APNIC | TW | 13th Jan 2010 |
| 180.204.0.0/14 | 262k | APNIC | TW | 23rd Sept 2009 |
| 180.217.0.0/16 | 65.5k | APNIC | TW | 6th Oct 2009 |
| 180.94.30.0/23 | 512 | APNIC | TW | 23rd Nov 2023 |
| 182.54.136.0/22 | 1k | APNIC | TW | 26th Jul 2016 |
| 192.160.29.0/24 | 256 | APNIC | TW | 16th Jan 2026 |