# IPv6 /52 Prefix – 4,096 /64 Subnets Explained

> An IPv6 /52 prefix spans 4,096 /64 subnets (75,557,863,725,914,323,419,136 addresses). Examples, roles and FAQs for planning IPv6 networks.

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# IPv6 /52 Prefix ReferenceIPv6

Department-scale delegation: a /52 holds 4,096 /64 subnets — sixteen times a residential /56, one sixteenth of a site /48. This is the tier for buildings, branches, and teams whose VLAN count has outgrown polite conversation.

An IPv6 /52 prefix contains 75,557,863,725,914,323,419,136 addresses, which splits into 4,096 standard /64 subnets.

## /52 facts at a glance

- **Total addresses:** 75,557,863,725,914,323,419,136 (276)
- **/64 subnets inside:** 4,096
- **Host/interface bits:** 76
- **Example network:** 2001:db8::/52
- **First address:** 2001:db8::
- **Last address:** 2001:db8:0:fff:ffff:ffff:ffff:ffff
- **Typical role:** Multi-tenant building or campus delegation

## A /52 in documentation space

Using `2001:db8::/32` (RFC 3849 documentation space) aligned to its own boundary, a /52 occupies:

| Block | First address | Last address |
| --- | --- | --- |
| 2001:db8::/52 | 2001:db8:: | 2001:db8:0:fff:ffff:ffff:ffff:ffff |

## How an IPv6 /52 prefix works

A /52 prefix pins the first 52 bits of a 128-bit address, leaving 76 bits free. That free portion holds 276 = 75,557,863,725,914,323,419,136 distinct addresses, and every such block begins at a multiple of that size. Because each subnet should be a /64, the 12 middle bits between the prefix and the /64 boundary give 4,096 subnets to hand out.

## Where /52 is used

- Branch offices and individual buildings drawing their own block from a corporate /44 or /48.
- Data-center rows where each rack group needs dozens of /64 segments.
- Business-class ISP delegations sized between residential handouts and full site grants.

Sixteen /56s nest neatly inside a /52, so you can re-delegate home-sized chunks downstream without breaking alignment.

At 4,096 /64s, even aggressive VLAN plans leave thousands of subnets idle — by design.

## Frequently asked questions

**How many /64s are in a /52?**

4,096. Twelve bits separate the prefixes, yielding just over four thousand standard subnets.

**How many /56s are in a /52?**

Sixteen — four bits' worth, which makes the /52 a natural parent for handing out home-style delegations.

**How many addresses does an IPv6 /52 have?**

75,557,863,725,914,323,419,136, which is 2^76.

**Is a /52 a common delegation size?**

It shows up mostly as a business-tier or intermediate delegation: consumer lines more often see /56 or /60, while whole sites typically jump straight to a /48.

## Open this prefix in the calculator

[Open 2001:db8::/52 in the IPv6 calculator](https://itinsighthub.com/ipv6-subnet-calculator/?q=2001%3Adb8%3A%3A%2F52)

### Related IPv6 prefixes

[/29](https://itinsighthub.com/ipv6/29/)[/32](https://itinsighthub.com/ipv6/32/)[/34](https://itinsighthub.com/ipv6/34/)[/36](https://itinsighthub.com/ipv6/36/)[/40](https://itinsighthub.com/ipv6/40/)[/42](https://itinsighthub.com/ipv6/42/)[/44](https://itinsighthub.com/ipv6/44/)[/47](https://itinsighthub.com/ipv6/47/)[/48](https://itinsighthub.com/ipv6/48/)[/56](https://itinsighthub.com/ipv6/56/)[/60](https://itinsighthub.com/ipv6/60/)[/64](https://itinsighthub.com/ipv6/64/)[/127](https://itinsighthub.com/ipv6/127/)[/128](https://itinsighthub.com/ipv6/128/)

← IPv6 /48 prefix
IPv6 /56 prefix →

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