ToolPing
Search for a tool... /
Theme
Language
English EN Nederlands NL Español ES Français FR
Contact (contact@toolping.nl) PixelPing.net (Image & PDF Tools) ↗
Tools
Ping Test DNS Lookup Speed Test Website Status & Down Checker SSL Checker Traceroute IP Lookup HTTP Headers Subnet Calculator (IPv4 & IPv6) Password Generator Regex Tester JSON Formatter Whois Lookup Base64 & URL Converter Port Scanner MAC Address Lookup

Subnet Calculator (IPv4 & IPv6)

Calculate IPv4 & IPv6 subnet masks, CIDR network ranges, usable host IPs, subnets, and reverse DNS records.

Load Example:
Advertisement

Subnet & CIDR Reference Guides

Standard IPv4 CIDR prefix lengths, subnet masks, total addresses, and usable host counts.

CIDR Subnet Mask Total IPs Usable Hosts Typical Use
/32255.255.255.25511Single Host / Loopback
/30255.255.255.25242Point-to-Point Links
/29255.255.255.24886Small Server Subnet
/28255.255.255.2401614Branch Office Subnet
/27255.255.255.2243230Department LAN
/26255.255.255.1926462Medium Business LAN
/25255.255.255.128128126Large Department Subnet
/24255.255.255.0256254Standard Class C LAN
/23255.255.254.0512510Supernet / Dual /24
/22255.255.252.01,0241,022Campus Network Block
/16255.255.0.065,53665,534Standard Class B Network
/8255.0.0.016,777,21616,777,214Standard Class A Network

About this tool: Subnet Calculator (IPv4 & IPv6)

Calculate IPv4 & IPv6 subnet masks, CIDR network ranges, usable host IPs, subnets, and reverse DNS records.

The dual-stack IPv4 & IPv6 Subnet Calculator assists network engineers in planning IP address allocations, routing tables, and firewall subnetting. It seamlessly computes IPv4 masks and host counts alongside full IPv6 expansions, RFC 5952 compression, /64 subnet counts, and ip6.arpa reverse DNS zones.

Belangrijkste Toepassingen & Voordelen

  • Plan IPv4 CIDR allocations and usable host ranges for corporate VLANs.
  • Calculate IPv6 subnet boundaries (/48 enterprise, /56 residential, /64 LAN) for cloud VPCs and routers.
  • Expand abbreviated IPv6 addresses into full 32-character hexadecimal format and vice-versa.
  • Generate DNS PTR records for IPv6 Reverse DNS zones (ip6.arpa).
  • Classify IPv6 address scopes including Global Unicast, Link-Local (fe80::), and Unique Local (fc00::).
Handige Tip & Best Practice: In IPv6 networking, always allocate a /64 prefix to every individual end-user LAN segment to maintain compatibility with SLAAC and Neighbor Discovery protocols.

This online diagnostic utility is powered by ToolPing to provide fast, reliable, and secure network analytics for sysadmins and developers.

Frequently Asked Questions (FAQ)

How do I calculate IPv4 subnets and CIDR notation?

Select the 'IPv4 Subnetting' tab, enter an IPv4 address (e.g. 192.168.1.0) and choose a CIDR prefix (/24). The tool instantly calculates network ID, broadcast IP, subnet mask, wildcard mask, and usable host count.

How does the IPv6 Subnet Calculator work?

Select the 'IPv6 Subnetting' tab, enter any IPv6 address and select your prefix length (/64, /56, /48). The tool computes full 8-hextet expansion, RFC 5952 compression, available /64 subnets, address scope, and reverse DNS ip6.arpa PTR zones.

Why is /64 the standard subnet prefix for IPv6 LAN networks?

In IPv6, a /64 prefix length is required for Stateless Address Autoconfiguration (SLAAC). The top 64 bits identify the subnet and the bottom 64 bits form the host interface ID.

Why doesn't IPv6 use Broadcast addresses?

IPv6 replaced broadcast with efficient Multicast (ff02::) and Anycast. This eliminates broadcast storms and ensures network devices only process traffic intended for them.

What is the difference between an ISP /48, /56, and /64 allocation?

A /64 provides 1 single subnet. A /56 allocation (typical for residential & SMB internet connections) contains 256 individual /64 subnets. A /48 allocation (for enterprise datacenters) provides 65,536 distinct /64 subnets.