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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 unannounced space registered through APNIC, largest first.
Unannounced blocks in Singapore
495 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 125.3.192.0/21 | 2k | APNIC |  SG | 25th Nov 2005 |
| 134.42.225.0/24 | 256 | APNIC | SG | 25th Apr 1989 |
| 134.65.112.0/21 | 2k | APNIC | SG | 30th Jul 1990 |
| 134.65.124.0/23 | 512 | APNIC | SG | 30th Jul 1990 |
| 134.65.96.0/20 | 4.1k | APNIC | SG | 30th Jul 1990 |
| 142.70.0.0/16 | 65.5k | APNIC | SG | 26th Mar 1990 |
| 142.79.192.0/19 | 8.2k | APNIC | SG | 30th Jul 2019 |
| 143.192.112.0/20 | 4.1k | APNIC | SG | 1st Oct 1990 |
| 143.244.0.0/19 | 8.2k | APNIC | SG | 22nd Jul 2020 |
| 144.79.112.0/23 | 512 | APNIC | SG | 11th Dec 2025 |
| 144.79.222.0/23 | 512 | APNIC | SG | 29th Dec 2025 |
| 144.89.128.0/17 | 32.8k | APNIC | SG | 20th Nov 1990 |
| 150.107.128.0/22 | 1k | APNIC | SG | 20th Jun 2014 |
| 152.235.128.0/17 | 32.8k | APNIC | SG | 20th Feb 2025 |
| 157.15.191.0/24 | 256 | APNIC | SG | 9th Feb 2024 |
| 159.13.128.0/18 | 16.4k | APNIC | SG | 24th Feb 1992 |
| 160.236.60.0/23 | 512 | APNIC | SG | 3rd Jul 2026 |
| 160.30.111.0/24 | 256 | APNIC | SG | 14th Aug 2024 |
| 161.248.214.0/23 | 512 | APNIC | SG | 19th Jan 2025 |
| 162.4.76.0/23 | 512 | APNIC | SG | 5th May 2026 |
| 163.128.62.0/23 | 512 | APNIC | SG | 16th Mar 2026 |
| 163.223.236.0/23 | 512 | APNIC | SG | 4th Apr 2025 |
| 163.227.209.0/24 | 256 | APNIC | SG | 2nd May 2025 |
| 163.61.116.0/24 | 256 | APNIC | SG | 12th Feb 2025 |
| 168.245.188.0/22 | 1k | APNIC | SG | 20th Sept 1994 |
| 168.75.0.0/18 | 16.4k | APNIC | SG | 9th Feb 1994 |
| 175.111.104.0/22 | 1k | APNIC | SG | 14th Jan 2010 |
| 175.176.224.0/19 | 8.2k | APNIC | SG | 28th Jan 2010 |
| 178.100.0.0/14 | 262k | APNIC | SG | 18th Nov 2009 |
| 178.106.0.0/16 | 65.5k | APNIC | SG | 18th Nov 2009 |
| 178.96.0.0/15 | 131k | APNIC | SG | 18th Nov 2009 |
| 179.192.0.0/16 | 65.5k | APNIC | SG | 20th Feb 2025 |
| 179.196.0.0/16 | 65.5k | APNIC | SG | 20th Feb 2025 |
| 179.70.0.0/15 | 131k | APNIC | SG | 20th Feb 2025 |
| 180.215.0.0/16 | 65.5k | APNIC | SG | 1st Oct 2009 |
| 180.222.204.0/22 | 1k | APNIC | SG | 15th Oct 2009 |
| 182.252.96.0/19 | 8.2k | APNIC | SG | 7th May 2010 |
| 187.42.128.0/18 | 16.4k | APNIC | SG | 20th Feb 2025 |
| 191.43.0.0/16 | 65.5k | APNIC | SG | 20th Feb 2025 |
| 192.138.188.0/24 | 256 | APNIC | SG | 7th Jan 2011 |
| 192.146.133.0/24 | 256 | APNIC | SG | 28th Jan 1992 |
| 192.153.251.0/24 | 256 | APNIC | SG | 15th Apr 1992 |
| 192.159.24.0/24 | 256 | APNIC | SG | 20th Apr 1992 |
| 192.159.25.0/24 | 256 | APNIC | SG | 20th Apr 1992 |
| 192.159.26.0/24 | 256 | APNIC | SG | 20th Apr 1992 |
| 192.159.27.0/24 | 256 | APNIC | SG | 20th Apr 1992 |
| 192.159.28.0/24 | 256 | APNIC | SG | 20th Apr 1992 |
| 192.159.29.0/24 | 256 | APNIC | SG | 20th Apr 1992 |
| 192.159.30.0/24 | 256 | APNIC | SG | 20th Apr 1992 |
| 192.169.35.0/24 | 256 | APNIC | SG | 12th May 1992 |