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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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, 22451 to 22500 of 27001
Prefix	Addresses	Registry	Country	Allocated
2604:e1c0::/32	4.3B × /64	ARIN	US	25th Jun 2018
2604:e240::/32	4.3B × /64	ARIN	US	26th Jun 2018
2604:e2c0::/32	4.3B × /64	ARIN	US	26th Jun 2018
2604:e300::/32	4.3B × /64	ARIN	US	20th May 2011
2604:e340::/32	4.3B × /64	ARIN	US	26th Jun 2018
2604:e4c0::/32	4.3B × /64	ARIN	US	27th Jun 2018
2604:e640::/32	4.3B × /64	ARIN	US	3rd Jul 2018
2604:e680::/32	4.3B × /64	ARIN	US	6th Aug 2013
2604:e6c0::/32	4.3B × /64	ARIN	US	5th Jul 2018
2604:e900::/32	4.3B × /64	ARIN	US	24th May 2011
2604:e940::/32	4.3B × /64	ARIN	US	19th Jul 2018
2604:e980::/32	4.3B × /64	ARIN	US	8th Aug 2013
2604:ec80::/32	4.3B × /64	ARIN	US	12th Aug 2013
2604:ed80::/32	4.3B × /64	ARIN	US	12th Aug 2013
2604:edc0::/32	4.3B × /64	ARIN	US	1st Aug 2018
2604:ee0::/32	4.3B × /64	ARIN	US	1st May 2025
2604:eec0::/32	4.3B × /64	ARIN	US	7th Aug 2018
2604:efc0::/32	4.3B × /64	ARIN	US	10th Aug 2018
2604:f040::/32	4.3B × /64	ARIN	US	13th Aug 2018
2604:f080::/32	4.3B × /64	ARIN	US	19th Aug 2013
2604:f20::/32	4.3B × /64	ARIN	US	6th May 2025
2604:f280::/32	4.3B × /64	ARIN	US	21st Aug 2013
2604:f2c0::/32	4.3B × /64	ARIN	US	22nd Aug 2018
2604:f300::/32	4.3B × /64	ARIN	US	26th May 2011
2604:f40::/32	4.3B × /64	ARIN	US	20th Jan 2017
2604:f480::/32	4.3B × /64	ARIN	US	21st Aug 2013
2604:f500::/32	4.3B × /64	ARIN	US	27th May 2011
2604:f5c0::/32	4.3B × /64	ARIN	US	7th Sept 2018
2604:f640::/36	268M × /64	ARIN	US	7th Sept 2018
2604:f7c0::/32	4.3B × /64	ARIN	US	18th Sept 2018
2604:f8c0::/32	4.3B × /64	ARIN	US	20th Sept 2018
2604:f900::/32	4.3B × /64	ARIN	US	27th May 2011
2604:f940::/32	4.3B × /64	ARIN	US	21st Sept 2018
2604:f980::/32	4.3B × /64	ARIN	US	28th Aug 2013
2604:fb00::/32	4.3B × /64	ARIN	US	27th May 2011
2604:fb40::/32	4.3B × /64	ARIN	US	26th Sept 2018
2604:fc40::/32	4.3B × /64	ARIN	US	9th Feb 2026
2604:fd40::/32	4.3B × /64	ARIN	US	2nd Oct 2018
2604:fdc0::/32	4.3B × /64	ARIN	US	2nd Oct 2018
2604:ff00::/32	4.3B × /64	ARIN	US	31st May 2011
2605:1040::/32	4.3B × /64	ARIN	US	5th Dec 2018
2605:10c0::/32	4.3B × /64	ARIN	US	6th Dec 2018
2605:1140::/32	4.3B × /64	ARIN	US	11th Dec 2018
2605:1180::/32	4.3B × /64	ARIN	US	22nd Oct 2013
2605:1340::/32	4.3B × /64	ARIN	US	3rd Jan 2019
2605:13c0::/32	4.3B × /64	ARIN	US	3rd Jan 2019
2605:1400::/32	4.3B × /64	ARIN	US	22nd Jul 2010
2605:1440::/32	4.3B × /64	ARIN	US	3rd Jan 2019
2605:1480::/32	4.3B × /64	ARIN	US	25th Oct 2013
2605:14c0::/32	4.3B × /64	ARIN	US	4th Jan 2019