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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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

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Countries with unannounced space registered through ARIN, largest first.

Unannounced blocks in United States

26,283 blocks match, ordered by prefix.

Allocated but unannounced blocks, 21951 to 22000 of 26283
Prefix	Addresses	Registry	Country	Allocated
2604:8cc0::/32	4.3B × /64	ARIN	US	19th Dec 2017
2604:8e00::/32	4.3B × /64	ARIN	US	21st Jan 2026
2604:8e40::/32	4.3B × /64	ARIN	US	21st Dec 2017
2604:9040::/32	4.3B × /64	ARIN	US	27th Dec 2017
2604:90c0::/32	4.3B × /64	ARIN	US	28th Dec 2017
2604:9140::/32	4.3B × /64	ARIN	US	28th Dec 2017
2604:91c0::/32	4.3B × /64	ARIN	US	29th Dec 2017
2604:9280::/32	4.3B × /64	ARIN	US	19th Mar 2013
2604:92c0::/32	4.3B × /64	ARIN	US	10th Jan 2018
2604:9300::/32	4.3B × /64	ARIN	US	27th Apr 2011
2604:9340::/32	4.3B × /64	ARIN	US	11th Jan 2018
2604:93c0::/32	4.3B × /64	ARIN	US	11th Jan 2018
2604:9480::/32	4.3B × /64	ARIN	US	21st Mar 2013
2604:94c0::/32	4.3B × /64	ARIN	US	17th Jan 2018
2604:9580::/32	4.3B × /64	ARIN	US	22nd Jul 2014
2604:9600::/32	4.3B × /64	ARIN	US	18th Nov 2010
2604:9640::/32	4.3B × /64	ARIN	US	19th Jan 2018
2604:9680::/32	4.3B × /64	ARIN	US	28th Jan 2026
2604:96c0::/32	4.3B × /64	ARIN	US	19th Jan 2018
2604:9700::/32	4.3B × /64	ARIN	US	27th Apr 2011
2604:9740::/32	4.3B × /64	ARIN	US	22nd Jan 2018
2604:97c0::/32	4.3B × /64	ARIN	US	23rd Jan 2018
2604:9940::/32	4.3B × /64	ARIN	US	23rd Jan 2018
2604:9a80::/32	4.3B × /64	ARIN	US	28th Mar 2013
2604:9ac0::/32	4.3B × /64	ARIN	US	25th Jan 2018
2604:9b80::/32	4.3B × /64	ARIN	US	28th Mar 2013
2604:9bc0::/32	4.3B × /64	ARIN	US	26th Jan 2018
2604:9c00::/32	4.3B × /64	ARIN	US	2nd Jul 2010
2604:9c40::/32	4.3B × /64	ARIN	US	29th Jan 2018
2604:9c80::/32	4.3B × /64	ARIN	US	29th Mar 2013
2604:9d00::/32	4.3B × /64	ARIN	US	29th Apr 2011
2604:9ec0::/32	4.3B × /64	ARIN	US	1st Feb 2018
2604:9f40::/32	4.3B × /64	ARIN	US	6th Feb 2018
2604::/32	4.3B × /64	ARIN	US	29th Jan 2010
2604:a000::/32	4.3B × /64	ARIN	US	2nd Mar 2010
2604:a080::/32	4.3B × /64	ARIN	US	3rd Apr 2013
2604:a20::/32	4.3B × /64	ARIN	US	31st Mar 2025
2604:a2c0::/32	4.3B × /64	ARIN	US	13th Feb 2018
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