How many addresses are in an IPv6 /34?

An IPv6 /34 contains 2⁹⁴ addresses. The prefix fixes the first 34 bits; the remaining 94 bits identify individual addresses in the block.

How many /64 subnets fit in a /34?

A /34 can be divided into 2³⁰ standard /64 LAN subnets. Each /64 holds 2⁶⁴ addresses, so the combined block is effectively inexhaustible for normal use.

How many /48 site allocations are in a /34?

A /34 contains 2¹⁴ /48 site allocations. A /48 is the classic size assigned to a business site or campus.

When would an organization receive a /34?

A /34 is assigned when an organization needs more address space than a single /48 but does not qualify for a full ISP-style /32. It is common for large enterprises with many branch offices.

What is the difference between /34 and /35?

A /34 is twice as large as /35. /34 has 2⁹⁴ addresses; /35 has 2⁹³. Each step down the prefix number doubles the address count.

How does /34 compare to /33?

A /33 is twice as large as /34. Moving from /34 to /33 adds one more fixed network bit, halving the host portion from 2⁹⁴ to 2⁹⁵ addresses.

IPv6 /34 Subnet Calculator

Results update as you type

A /34 block fixes the first 34 bits of the address, leaving 94 host bits and 2⁹⁴ total addresses. It subdivides into about 2³⁰ /64 LAN subnets. That is also 2¹⁴ /48 site allocations. A /34 sits between the standard ISP /32 and the site /48 — useful when an organization needs more than one /48 but less than a full /32.

Prefix length

/128

/34 = 2⁹⁴ addresses (≈ 1.98 × 10²⁸)

Results for 2001:db8:8000::/34

Documentation (RFC 3849)Global scope

Network / prefixThe first address — identifies the subnet itself

First addressSubnet-router anycast; first address in the block

Last addressThe highest address in this block

Prefix maskEquivalent to /34

Total addresses≈ 1.98 × 10²⁸ addresses

Address typeGlobally routable scope

More detailsNeighboring subnets, expanded address, reverse DNS, and hextet breakdown

Neighboring /34 subnets

Expanded address
Compressed address
Network (expanded)
Last address (expanded)
Prefix mask
Total addresses (exact)
Reverse DNS (PTR)
Host bits / network bits

Hextet breakdown

20010db8abcd00000000000000000000

NetworkSplit groupHost

Quick facts for IPv6 /34

Prefix mask: ffff:ffff:c000::
Total addresses: 2⁹⁴
Approx. count: 1.98 × 10²⁸
/64 subnets: 2³⁰

IPv6 /34 reference guideBit split, overview, key facts, sizing tables, design notes, standards, and FAQ

Network / host bit split

netnetmixhosthosthosthosthost

Network bits (34)Split hextetHost bits (94)

Network bits: 34
Host bits: 94
Prefix mask: ffff:ffff:c000::
Total addresses: 2⁹⁴
Approx. count: 1.98 × 10²⁸
/64 subnets: 2³⁰
Addresses formula: 2^94
/64 relationship: 2³⁰ × /64 subnets

Overview

Common use cases

Enterprise or ISP allocations above site size
Multi-site organizations needing several /48s
Address renumbering and growth planning

Key facts

A /34 fixes 34 network bits and leaves 94 host bits — 2⁹⁴ total addresses.
In network design terms, /34 is typically a enterprise or multi-site allocation.
You can subnet a /34 into about 2³⁰ /64 LANs.
At site scale, /34 equals 2¹⁴ /48 allocations.

Design guidance

A /34 suits organizations that have outgrown a single /48 but do not need a full /32 ISP allocation. Plan your addressing scheme before delegating: assign one /48 (or smaller) per major site, then subnet each site into /64 LANs. Document your nibble boundaries so future growth does not force renumbering.

Practical example

An ISP holding 2001:db8:abcd::/34 might announce the entire /34 to upstream providers as one BGP route, then delegate /48 blocks such as 2001:db8:0001::/48 and 2001:db8:0002::/48 to business customers. Each customer subnets their /48 into /64 LANs.

Related RFCs and standards

RFC 4291IPv6 Addressing Architecture

Prefix sizing reference

Divide /34 into…

Prefix	Subnets	Addresses each
/35	2	2⁹³
/36	4	2⁹²
/38	16	2⁹⁰
/42	256	2⁸⁶

/34 fits inside…

Supernet	Addresses	/34s inside
/33	2⁹⁵	2
/32	2⁹⁶	4
/30	2⁹⁸	16
/26	2¹⁰²	256

Frequently asked questions

Common questions about IPv6 /34 blocks, prefix sizes, and use cases.

Common IPv6 prefix sizes

/3 /12 /16 /20 /24 /28 /32 /36 /40 /44 /48 /52 /56 /60 /64 /80 /96 /112 /120 /124 /126 /127 /128