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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 unannounced space registered through ARIN, largest first.
Unannounced blocks in Puerto Rico
65 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 169.197.184.0/22 | 1k | ARIN |  PR | 5th Jan 2021 |
| 170.205.12.0/22 | 1k | ARIN | PR | 11th Jul 2023 |
| 173.225.72.0/21 | 2k | ARIN | PR | 28th Jan 2025 |
| 192.101.169.0/24 | 256 | ARIN | PR | 11th Jul 1991 |
| 192.160.174.0/24 | 256 | ARIN | PR | 2nd Jun 1992 |
| 192.160.175.0/24 | 256 | ARIN | PR | 2nd Jun 1992 |
| 192.160.176.0/24 | 256 | ARIN | PR | 2nd Jun 1992 |
| 192.189.95.0/24 | 256 | ARIN | PR | 13th Jul 1992 |
| 192.207.48.0/24 | 256 | ARIN | PR | 12th Jul 1994 |
| 192.231.93.0/24 | 256 | ARIN | PR | 1st Oct 1992 |
| 192.231.94.0/23 | 512 | ARIN | PR | 1st Oct 1992 |
| 192.231.96.0/23 | 512 | ARIN | PR | 1st Oct 1992 |
| 192.65.176.0/24 | 256 | ARIN | PR | 28th Nov 1989 |
| 196.1.141.0/24 | 256 | ARIN | PR | 17th Jan 1995 |
| 198.204.71.0/24 | 256 | ARIN | PR | 17th May 1994 |
| 198.204.72.0/24 | 256 | ARIN | PR | 17th May 1994 |
| 198.245.139.0/24 | 256 | ARIN | PR | 23rd Jun 1994 |
| 198.55.16.0/21 | 2k | ARIN | PR | 7th May 1993 |
| 199.7.168.0/22 | 1k | ARIN | PR | 15th Jun 2010 |
| 200.5.11.0/24 | 256 | ARIN | PR | 31st Aug 1995 |
| 200.5.8.0/24 | 256 | ARIN | PR | 15th May 1995 |
| 2001:500:10::/48 | 65.5k × /64 | ARIN | PR | 7th Nov 2006 |
| 2001:504:1d::/48 | 65.5k × /64 | ARIN | PR | 9th Feb 2011 |
| 204.138.0.0/24 | 256 | ARIN | PR | 9th Jun 2020 |
| 204.144.78.0/24 | 256 | ARIN | PR | 4th Jan 1995 |
| 204.154.228.0/24 | 256 | ARIN | PR | 18th Nov 1994 |
| 204.238.70.0/24 | 256 | ARIN | PR | 25th Mar 2020 |
| 204.52.222.0/24 | 256 | ARIN | PR | 1st Jul 2026 |
| 206.168.250.0/23 | 512 | ARIN | PR | 6th Apr 2023 |
| 206.198.180.0/24 | 256 | ARIN | PR | 1st Jul 2026 |
| 206.51.0.0/24 | 256 | ARIN | PR | 14th Jan 2011 |
| 207.167.84.0/22 | 1k | ARIN | PR | 11th Jan 2022 |
| 23.150.240.0/24 | 256 | ARIN | PR | 18th Feb 2020 |
| 23.152.36.0/24 | 256 | ARIN | PR | 7th Jan 2026 |
| 23.179.194.0/24 | 256 | ARIN | PR | 26th Aug 2021 |
| 2602:f79f::/36 | 268M × /64 | ARIN | PR | 12th Nov 2024 |
| 2602:fbe3::/36 | 268M × /64 | ARIN | PR | 11th Jan 2022 |
| 2602:fcb5::/36 | 268M × /64 | ARIN | PR | 5th Mar 2021 |
| 2602:fcdc::/36 | 268M × /64 | ARIN | PR | 16th Dec 2020 |
| 2602:fcf6::/36 | 268M × /64 | ARIN | PR | 20th Oct 2020 |
| 2602:fd44::/36 | 268M × /64 | ARIN | PR | 15th Jun 2020 |
| 2602:fd75::/36 | 268M × /64 | ARIN | PR | 11th Feb 2020 |
| 2602:fd77::/36 | 268M × /64 | ARIN | PR | 7th Feb 2020 |
| 2602:fdc5::/36 | 268M × /64 | ARIN | PR | 1st Jul 2019 |
| 2602:fdf5::/36 | 268M × /64 | ARIN | PR | 25th Mar 2019 |
| 2602:fdfb::/36 | 268M × /64 | ARIN | PR | 8th Mar 2019 |
| 2604:1400::/32 | 4.3B × /64 | ARIN | PR | 17th Jun 2010 |
| 2604:17e0::/32 | 4.3B × /64 | ARIN | PR | 22nd Jul 2025 |
| 2604:1da0::/32 | 4.3B × /64 | ARIN | PR | 19th Aug 2025 |
| 2604:2d40::/32 | 4.3B × /64 | ARIN | PR | 31st Mar 2017 |