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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 registered through ARIN

30,441 blocks match, ordered by prefix.

Allocated but unannounced blocks, 26301 to 26350 of 30441
Prefix	Addresses	Registry	Country	Allocated
2606:1240::/32	4.3B × /64	ARIN	US	11th Dec 2020
2606:1300::/32	4.3B × /64	ARIN	US	27th Sept 2011
2606:1400::/32	4.3B × /64	ARIN	US	30th Aug 2010
2606:140::/32	4.3B × /64	ARIN	US	21st Oct 2020
2606:14c0::/32	4.3B × /64	ARIN	US	21st Dec 2020
2606:1580::/32	4.3B × /64	ARIN	US	13th Apr 2015
2606:15c0::/32	4.3B × /64	ARIN	US	23rd Dec 2020
2606:16c0::/32	4.3B × /64	ARIN	CA	30th Dec 2020
2606:1740::/32	4.3B × /64	ARIN	US	31st Dec 2020
2606:17c0::/32	4.3B × /64	ARIN	US	31st Dec 2020
2606:1800::/32	4.3B × /64	ARIN	US	17th May 2010
2606:180::/32	4.3B × /64	ARIN	US	2nd Mar 2015
2606:1840::/32	4.3B × /64	ARIN	US	4th Jan 2021
2606:1880::/32	4.3B × /64	ARIN	US	28th Apr 2015
2606:18c0::/32	4.3B × /64	ARIN	US	5th Jan 2021
2606:1940::/32	4.3B × /64	ARIN	US	23rd Apr 2026
2606:1a80::/32	4.3B × /64	ARIN	US	30th Apr 2015
2606:1ac0::/32	4.3B × /64	ARIN	US	6th Jan 2021
2606:1d00::/32	4.3B × /64	ARIN	US	30th Sept 2011
2606:1d80::/32	4.3B × /64	ARIN	US	23rd Apr 2026
2606:1dc0::/32	4.3B × /64	ARIN	US	13th Jan 2021
2606:1e40::/32	4.3B × /64	ARIN	US	15th Jan 2021
2606:1ec0::/32	4.3B × /64	ARIN	BM	15th Jan 2021
2606:1f00::/32	4.3B × /64	ARIN	US	28th May 2013
2606:1f40::/32	4.3B × /64	ARIN	US	15th Jan 2021
2606:2000::/32	4.3B × /64	ARIN	US	5th Mar 2010
2606:2080::/32	4.3B × /64	ARIN	US	11th May 2015
2606:20c0::/32	4.3B × /64	ARIN	US	20th Jan 2021
2606:2100::/32	4.3B × /64	ARIN	US	3rd Oct 2011
2606:21c0::/32	4.3B × /64	ARIN	CA	21st Jan 2021
2606:2240::/32	4.3B × /64	ARIN	US	25th Jan 2021
2606:2280::/32	4.3B × /64	ARIN	US	14th May 2015
2606:2300::/32	4.3B × /64	ARIN	US	6th Oct 2011
2606:2340::/32	4.3B × /64	ARIN	CA	1st Feb 2021
2606:2540::/32	4.3B × /64	ARIN	US	5th Feb 2021
2606:2640::/32	4.3B × /64	ARIN	US	9th Feb 2021
2606:2780::/32	4.3B × /64	ARIN	US	26th May 2015
2606:27c0::/32	4.3B × /64	ARIN	US	17th Feb 2021
2606:2840::/32	4.3B × /64	ARIN	US	18th Feb 2021
2606:2880::/32	4.3B × /64	ARIN	US	28th May 2015
2606:28c0::/32	4.3B × /64	ARIN	US	19th Feb 2021
2606:2900::/32	4.3B × /64	ARIN	US	10th Oct 2011
2606:2940::/32	4.3B × /64	ARIN	US	19th Feb 2021
2606:2a40::/32	4.3B × /64	ARIN	US	23rd Feb 2021
2606:2b40::/32	4.3B × /64	ARIN	US	4th Mar 2021
2606:2bc0::/32	4.3B × /64	ARIN	CA	4th Mar 2021
2606:2c00::/32	4.3B × /64	ARIN	US	2nd Sept 2010
2606:2d40::/32	4.3B × /64	ARIN	US	9th Mar 2021
2606:2d80::/32	4.3B × /64	ARIN	US	5th May 2026
2606:2dc0::/32	4.3B × /64	ARIN	US	9th Mar 2021