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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
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Countries with the most unannounced blocks, largest first.
Unannounced blocks in Singapore
528 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 2a0e:f380::/29 | 34.4B × /64 | RIPE NCC |  SG | 14th Jun 2019 |
| 2a0f:5c0::/29 | 34.4B × /64 | RIPE NCC | SG | 23rd Oct 2019 |
| 2a0f:7340::/29 | 34.4B × /64 | RIPE NCC | SG | 28th Oct 2025 |
| 2a10:e580::/29 | 34.4B × /64 | RIPE NCC | SG | 21st Jan 2021 |
| 2a10:e6c0::/32 | 4.3B × /64 | RIPE NCC | SG | 30th Apr 2024 |
| 2a11:b00::/29 | 34.4B × /64 | RIPE NCC | SG | 14th May 2021 |
| 2a12:1440::/29 | 34.4B × /64 | RIPE NCC | SG | 17th Dec 2021 |
| 2a13:96c0::/29 | 34.4B × /64 | RIPE NCC | SG | 19th Jul 2023 |
| 36.255.124.0/22 | 1k | APNIC | SG | 18th Feb 2016 |
| 36.3.160.0/19 | 8.2k | APNIC | SG | 1st Feb 2011 |
| 43.225.152.0/22 | 1k | APNIC | SG | 5th Dec 2014 |
| 43.225.4.0/22 | 1k | APNIC | SG | 29th Nov 2014 |
| 43.227.240.0/22 | 1k | APNIC | SG | 24th Dec 2014 |
| 43.245.252.0/22 | 1k | APNIC | SG | 4th Jun 2014 |
| 43.249.12.0/22 | 1k | APNIC | SG | 2nd Oct 2014 |
| 43.249.212.0/22 | 1k | APNIC | SG | 15th Oct 2014 |
| 43.255.124.0/22 | 1k | APNIC | SG | 5th Aug 2014 |
| 45.112.80.0/23 | 512 | APNIC | SG | 26th Feb 2015 |
| 45.113.128.0/22 | 1k | APNIC | SG | 20th Mar 2015 |
| 45.126.164.0/22 | 1k | APNIC | SG | 4th Sept 2015 |
| 49.213.56.0/23 | 512 | APNIC | SG | 18th Aug 2025 |
| 52.128.128.0/19 | 8.2k | APNIC | SG | 23rd Jun 2016 |
| 59.153.76.0/22 | 1k | APNIC | SG | 15th Oct 2015 |
| 61.16.28.0/22 | 1k | APNIC | SG | 8th Nov 2000 |
| 64.70.224.0/19 | 8.2k | APNIC | SG | 3rd Apr 2000 |
| 91.110.0.0/17 | 32.8k | APNIC | SG | 8th Aug 2006 |
| 91.85.0.0/19 | 8.2k | APNIC | SG | 31st Jul 2006 |
| 92.243.74.0/23 | 512 | RIPE NCC | SG | 15th Jan 2008 |