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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
Browse by country
Countries with the most unannounced blocks, largest first.
Unannounced blocks in Singapore
529 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 124.158.64.0/19 | 8.2k | APNIC |  SG | 3rd Oct 2007 |
| 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 |
| 151.146.0.0/16 | 65.5k | ARIN | SG | 26th Feb 1991 |
| 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 |
| 185.218.176.0/22 | 1k | RIPE NCC | SG | 24th Aug 2017 |
| 187.42.128.0/18 | 16.4k | APNIC | SG | 20th Feb 2025 |
| 191.219.128.0/19 | 8.2k | RIPE NCC | SG | 13th Mar 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 |