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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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, 26751 to 26800 of 30441
Prefix	Addresses	Registry	Country	Allocated
2607:35c0::/32	4.3B × /64	ARIN	US	15th Mar 2023
2607:3680::/32	4.3B × /64	ARIN	US	22nd Apr 2016
2607:3780::/32	4.3B × /64	ARIN	US	25th Apr 2016
2607:37c0::/32	4.3B × /64	ARIN	US	27th Mar 2023
2607:3880::/32	4.3B × /64	ARIN	US	8th Jun 2026
2607:38c0::/32	4.3B × /64	ARIN	US	30th Mar 2023
2607:3900::/32	4.3B × /64	ARIN	US	23rd Mar 2012
2607:3980::/32	4.3B × /64	ARIN	US	25th Apr 2016
2607:3a00::/32	4.3B × /64	ARIN	US	24th Feb 2011
2607:3ac0::/32	4.3B × /64	ARIN	CA	5th Apr 2023
2607:3b00::/32	4.3B × /64	ARIN	US	27th Mar 2012
2607:3b80::/32	4.3B × /64	ARIN	CA	9th Jun 2026
2607:3bc0::/32	4.3B × /64	ARIN	US	6th Apr 2023
2607:3c0::/32	4.3B × /64	ARIN	US	4th Nov 2022
2607:3c80::/32	4.3B × /64	ARIN	US	27th Apr 2016
2607:3d80::/32	4.3B × /64	ARIN	US	27th Apr 2016
2607:3e40::/32	4.3B × /64	ARIN	US	14th Apr 2023
2607:3e80::/32	4.3B × /64	ARIN	US	27th Apr 2016
2607:3ec0::/32	4.3B × /64	ARIN	US	14th Apr 2023
2607:3f80::/32	4.3B × /64	ARIN	US	29th Apr 2016
2607:40::/32	4.3B × /64	ARIN	US	14th Oct 2022
2607:40c0::/32	4.3B × /64	ARIN	US	20th Apr 2023
2607:4180::/32	4.3B × /64	ARIN	US	29th Apr 2016
2607:4340::/32	4.3B × /64	ARIN	US	1st May 2023
2607:4380::/32	4.3B × /64	ARIN	US	4th May 2016
2607:4400::/32	4.3B × /64	ARIN	US	1st Oct 2010
2607:4540::/32	4.3B × /64	ARIN	US	4th May 2023
2607:4680::/32	4.3B × /64	ARIN	US	9th May 2016
2607:4740::/32	4.3B × /64	ARIN	US	4th May 2023
2607:47c0::/32	4.3B × /64	ARIN	US	5th May 2023
2607:4840::/32	4.3B × /64	ARIN	US	5th May 2023
2607:4880::/32	4.3B × /64	ARIN	US	10th May 2016
2607:48c0::/32	4.3B × /64	ARIN	US	9th May 2023
2607:4900::/32	4.3B × /64	ARIN	US	4th Apr 2012
2607:4940::/32	4.3B × /64	ARIN	US	11th May 2023
2607:4ac0::/32	4.3B × /64	ARIN	US	15th May 2023
2607:4b40::/32	4.3B × /64	ARIN	US	15th May 2023
2607:4c00::/32	4.3B × /64	ARIN	CA	4th Oct 2010
2607:4c40::/32	4.3B × /64	ARIN	US	17th May 2023
2607:4ca0::/32	4.3B × /64	ARIN	US	22nd Jul 2026
2607:4d80::/32	4.3B × /64	ARIN	US	11th May 2016
2607:4e40::/32	4.3B × /64	ARIN	US	22nd May 2023
2607:4ec0::/32	4.3B × /64	ARIN	US	23rd May 2023
2607:4fc0::/32	4.3B × /64	ARIN	US	31st May 2023
2607:5000::/30	17.2B × /64	ARIN	US	12th Apr 2010
2607:5004::/31	8.6B × /64	ARIN	US	12th Apr 2010
2607:5006::/32	4.3B × /64	ARIN	US	12th Apr 2010
2607:5080::/32	4.3B × /64	ARIN	US	19th May 2016
2607:5140::/32	4.3B × /64	ARIN	US	5th Jun 2023
2607:51c0::/32	4.3B × /64	ARIN	US	7th Jun 2023