# IPv6 /34 Prefix – 1,073,741,824 /64 Subnets Explained

> An IPv6 /34 prefix spans 1,073,741,824 /64 subnets (19,807,040,628,566,084,398,385,987,584 addresses). Examples, roles and FAQs for planning IPv6 networks.

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# IPv6 /34 Prefix ReferenceIPv6

A /32 quartered: carve one operator block into four equal slices and each slice is a /34, holding 1,073,741,824 /64 subnets apiece. You will seldom meet one in the wild — this is a knife size for internal carving, not a catalog size for ordering.

An IPv6 /34 prefix contains 19,807,040,628,566,084,398,385,987,584 addresses, which splits into 1,073,741,824 standard /64 subnets.

## /34 facts at a glance

- **Total addresses:** 19,807,040,628,566,084,398,385,987,584 (294)
- **/64 subnets inside:** 1,073,741,824
- **Host/interface bits:** 94
- **Example network:** 2001:db8::/34
- **First address:** 2001:db8::
- **Last address:** 2001:db8:3fff:ffff:ffff:ffff:ffff:ffff
- **Typical role:** Regional aggregation block

## A /34 in documentation space

Using `2001:db8::/32` (RFC 3849 documentation space) aligned to its own boundary, a /34 occupies:

| Block | First address | Last address |
| --- | --- | --- |
| 2001:db8::/34 | 2001:db8:: | 2001:db8:3fff:ffff:ffff:ffff:ffff:ffff |

## How an IPv6 /34 prefix works

A /34 prefix pins the first 34 bits of a 128-bit address, leaving 94 bits free. That free portion holds 294 = 19,807,040,628,566,084,398,385,987,584 distinct addresses, and every such block begins at a multiple of that size. Because each subnet should be a /64, the 30 middle bits between the prefix and the /64 boundary give 1,073,741,824 subnets to hand out.

## Where /34 is used

- Splitting a /32 aggregate among regions, products, or tenants.
- Internal partitioning inside large hosting and carrier networks.
- Growth staging: hold three quarters in reserve while one /34 serves active buildout.

Allocation paperwork favors nibble boundaries (multiples of four bits), which is one reason sizes like /34 surface mainly as internal splits rather than official grants.

From a /34 the descent stays round: four /36s, sixteen /38s, sixty-four /40s.

## Frequently asked questions

**How many addresses does an IPv6 /34 have?**

19,807,040,628,566,084,398,385,987,584 — that is 2^94, ninety-four host bits wide.

**How many /40s are in a /34?**

Sixty-four. Six bits separate the prefixes, so each /34 retails into 64 blocks of /40.

**How many /48s fit inside a /34?**

16,384. Fourteen bits lie between /34 and the classic site size.

**Why does nobody announce a /34?**

Mostly convention: registry policy and reverse-DNS delegation both work best on nibble boundaries, so /34s tend to stay hidden inside larger aggregates.

## Open this prefix in the calculator

[Open 2001:db8::/34 in the IPv6 calculator](https://itinsighthub.com/ipv6-subnet-calculator/?q=2001%3Adb8%3A%3A%2F34)

### Related IPv6 prefixes

[/29](https://itinsighthub.com/ipv6/29/)[/32](https://itinsighthub.com/ipv6/32/)[/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/)[/52](https://itinsighthub.com/ipv6/52/)[/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 /32 prefix
IPv6 /36 prefix →

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