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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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

27,001 blocks match, ordered by prefix.

Allocated but unannounced blocks, 22351 to 22400 of 27001
Prefix	Addresses	Registry	Country	Allocated
2604:a40::/32	4.3B × /64	ARIN	US	11th Jan 2017
2604:a480::/32	4.3B × /64	ARIN	US	5th Apr 2013
2604:a4c0::/32	4.3B × /64	ARIN	US	20th Feb 2018
2604:a600::/32	4.3B × /64	ARIN	US	29th Jan 2026
2604:a60::/32	4.3B × /64	ARIN	US	4th Apr 2025
2604:a680::/32	4.3B × /64	ARIN	US	10th Apr 2013
2604:a6c0::/32	4.3B × /64	ARIN	US	22nd Feb 2018
2604:a700::/32	4.3B × /64	ARIN	US	2nd May 2011
2604:a7c0::/32	4.3B × /64	ARIN	US	23rd Feb 2018
2604:a800::/32	4.3B × /64	ARIN	US	22nd Apr 2010
2604:a80::/32	4.3B × /64	ARIN	US	15th Aug 2012
2604:a980::/32	4.3B × /64	ARIN	US	17th Apr 2013
2604:a9c0::/32	4.3B × /64	ARIN	US	27th Feb 2018
2604:aa00::/32	4.3B × /64	ARIN	US	22nd Nov 2010
2604:aa40::/32	4.3B × /64	ARIN	US	28th Feb 2018
2604:ab00::/32	4.3B × /64	ARIN	US	3rd May 2011
2604:ab40::/32	4.3B × /64	ARIN	US	2nd Mar 2018
2604:ac00::/32	4.3B × /64	ARIN	US	6th Jul 2010
2604:ac40::/32	4.3B × /64	ARIN	US	6th Mar 2018
2604:ac80::/32	4.3B × /64	ARIN	US	18th Apr 2013
2604:ad80::/32	4.3B × /64	ARIN	US	30th Apr 2014
2604:adc0::/32	4.3B × /64	ARIN	US	8th Mar 2018
2604:ae40::/32	4.3B × /64	ARIN	US	8th Mar 2018
2604:afc0::/32	4.3B × /64	ARIN	US	13th Mar 2018
2604:b00::/32	4.3B × /64	ARIN	US	10th Jul 2026
2604:b140::/32	4.3B × /64	ARIN	US	13th Mar 2018
2604:b1c0::/32	4.3B × /64	ARIN	US	14th Mar 2018
2604:b20::/32	4.3B × /64	ARIN	US	10th Apr 2025
2604:b240::/32	4.3B × /64	ARIN	US	14th Mar 2018
2604:b4c0::/32	4.3B × /64	ARIN	US	22nd Mar 2018
2604:b560::/32	4.3B × /64	ARIN	US	14th Jul 2026
2604:b620::/32	4.3B × /64	ARIN	US	17th Jul 2026
2604:b6c0::/32	4.3B × /64	ARIN	US	23rd Mar 2018
2604:b700::/32	4.3B × /64	ARIN	US	6th May 2011
2604:b740::/32	4.3B × /64	ARIN	US	26th Mar 2018
2604:b780::/36	268M × /64	ARIN	US	9th Feb 2016
2604:b7c0::/32	4.3B × /64	ARIN	US	26th Mar 2018
2604:b880::/32	4.3B × /64	ARIN	US	3rd May 2013
2604:b8c0::/32	4.3B × /64	ARIN	US	27th Mar 2018
2604:b940::/32	4.3B × /64	ARIN	US	27th Mar 2018
2604:b9c0::/32	4.3B × /64	ARIN	US	28th Mar 2018
2604:ba80::/32	4.3B × /64	ARIN	US	7th May 2013
2604:bc00::/32	4.3B × /64	ARIN	US	7th Jul 2010
2604:bd00::/32	4.3B × /64	ARIN	US	9th May 2011
2604:be00::/32	4.3B × /64	ARIN	US	23rd Nov 2010
2604:be80::/32	4.3B × /64	ARIN	US	14th May 2013
2604:bec0::/32	4.3B × /64	ARIN	US	5th Apr 2018
2604:bf80::/32	4.3B × /64	ARIN	US	16th May 2013
2604:c000::/32	4.3B × /64	ARIN	US	23rd Feb 2010
2604:c080::/32	4.3B × /64	ARIN	US	16th May 2013