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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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, 22201 to 22250 of 26283
Prefix	Addresses	Registry	Country	Allocated
2605:3900::/32	4.3B × /64	ARIN	US	15th Jun 2011
2605:39c0::/32	4.3B × /64	ARIN	US	18th Apr 2019
2605:3c00::/32	4.3B × /64	ARIN	US	30th Jul 2010
2605:3e40::/28	68.7B × /64	ARIN	US	30th Apr 2019
2605:3ec0::/32	4.3B × /64	ARIN	US	1st May 2019
2605:3fc0::/32	4.3B × /64	ARIN	US	6th Mar 2026
2605:400::/32	4.3B × /64	ARIN	US	20th Jul 2010
2605:40::/32	4.3B × /64	ARIN	US	10th Oct 2018
2605:4100::/32	4.3B × /64	ARIN	US	16th Jun 2011
2605:4140::/32	4.3B × /64	ARIN	US	6th May 2019
2605:41c0::/32	4.3B × /64	ARIN	US	6th May 2019
2605:4280::/32	4.3B × /64	ARIN	US	12th Feb 2014
2605:42c0::/32	4.3B × /64	ARIN	US	9th May 2019
2605:43c0::/32	4.3B × /64	ARIN	US	13th May 2019
2605:4440::/32	4.3B × /64	ARIN	US	13th May 2019
2605:4540::/32	4.3B × /64	ARIN	US	14th May 2019
2605:4580::/32	4.3B × /64	ARIN	US	18th Feb 2014
2605:4600::/32	4.3B × /64	ARIN	US	28th Dec 2010
2605:4740::/32	4.3B × /64	ARIN	US	23rd May 2019
2605:4780::/32	4.3B × /64	ARIN	US	20th Feb 2014
2605:4800::/32	4.3B × /64	ARIN	US	3rd May 2010
2605:4b40::/32	4.3B × /64	ARIN	US	31st May 2019
2605:4bc0::/32	4.3B × /64	ARIN	US	31st May 2019
2605:4c00::/32	4.3B × /64	ARIN	US	11th Mar 2026
2605:4c80::/32	4.3B × /64	ARIN	US	26th Feb 2014
2605:4d00::/32	4.3B × /64	ARIN	US	23rd Jun 2011
2605:4d40::/32	4.3B × /64	ARIN	US	7th Jun 2019
2605:4dc0::/36	268M × /64	ARIN	US	11th Jun 2019
2605:4e00::/32	4.3B × /64	ARIN	US	28th Dec 2010
2605:4ec0::/32	4.3B × /64	ARIN	US	25th Jun 2019
2605:4f40::/32	4.3B × /64	ARIN	US	25th Jun 2019
2605:4f80::/32	4.3B × /64	ARIN	US	4th Mar 2014
2605:50c0::/32	4.3B × /64	ARIN	US	1st Jul 2019
2605:5100::/32	4.3B × /64	ARIN	US	24th Jun 2011
2605:5140::/32	4.3B × /64	ARIN	US	3rd Jul 2019
2605:5180::/32	4.3B × /64	ARIN	US	10th Mar 2014
2605:51c0::/32	4.3B × /64	ARIN	US	3rd Jul 2019
2605:5240::/32	4.3B × /64	ARIN	US	11th Jul 2019
2605:5280::/32	4.3B × /64	ARIN	US	11th Mar 2014
2605:5340::/32	4.3B × /64	ARIN	US	15th Jul 2019
2605:5380::/32	4.3B × /64	ARIN	US	18th Jul 2019
2605:53c0::/32	4.3B × /64	ARIN	US	15th Jul 2019
2605:5400::/32	4.3B × /64	ARIN	US	4th Aug 2010
2605:540::/32	4.3B × /64	ARIN	US	25th Oct 2018
2605:5440::/32	4.3B × /64	ARIN	US	15th Jul 2019
2605:5540::/32	4.3B × /64	ARIN	US	17th Jul 2019
2605:55c0::/32	4.3B × /64	ARIN	US	17th Jul 2019
2605:5600::/32	4.3B × /64	ARIN	US	3rd Jan 2011
2605:5680::/32	4.3B × /64	ARIN	US	13th Mar 2014
2605:5700::/32	4.3B × /64	ARIN	US	29th Jun 2011