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IP Range CalculatorPRO
IPv4 Subnetting & RangeInstant Client-Side Tool

IPv4 /32 Host Route Calculator

Calculate single-address IPv4 prefix details.

IPv4 /32 Host Route Calculator: inputs and results

Enter an IP address, CIDR prefix, or range. Then check its first and last address below.

Quick presets:

Calculated Boundaries & ParametersReady

Network Address192.168.1.0
Broadcast Address192.168.1.255
First Usable Host192.168.1.1
Last Usable Host192.168.1.254
Subnet Mask255.255.255.0
Wildcard Mask0.0.0.255
Total Addresses256
Usable Host Range254

Key Capabilities

  • •100% Client-Side: Zero telemetry or server latency.
  • •RFC Compliant: Exact 32-bit and 128-bit integer precision.
  • •Quick Copy: Instant access to CIDR, mask, and range bounds.
  • •Cross-Platform: Works on desktop, tablet, and mobile browsers.
Open Full Interactive Suite

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IPv4 Broadcast Address Calculator

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First and Last Address Calculator

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Usable IPv4 Host Range Calculator

Apply the selected subnet-use rules.

How IPv4 /32 Host Route Calculator Works?

This tool works by treating one IPv4 address as a complete prefix with 32 network bits and 0 host bits, then returning the mask, wildcard, and route form of that address.

  1. Enter one address

    Type a single address such as 192.0.2.10.

  2. Set the prefix to /32

    All 32 bits become network bits. The mask is 255.255.255.255.

  3. Derive the wildcard

    The wildcard is 0.0.0.0, which matches exactly one address in ACLs.

  4. Show the host route forms

    The calculator prints the CIDR form, the mask form, and the ACL host keyword form.

IPv4 /32 Host Route Calculator Formula

The formula is Network = Broadcast = First = Last = IP, with Mask = 255.255.255.255.

Mask

Mask = 2^32 − 1 = 255.255.255.255

All 32 bits set to 1.

Wildcard

Wildcard = 0.0.0.0

No bits are ignored.

Address count

Total = 2^(32−32) = 1

One address, no reservations.

Route form

IP/32

The most specific route possible in IPv4.

Worked example: 192.0.2.10

CIDR      = 192.0.2.10/32
Mask      = 255.255.255.255
Wildcard  = 0.0.0.0
ACL form  = host 192.0.2.10
Addresses = 1

IPv4 /32 Host Route Calculator Conversion Table

The table shows 8 sample addresses as /32 host routes, with the mask, wildcard, integer value, and common role.

AddressHost RouteMaskWildcardIntegerCommon Role
10.0.0.110.0.0.1/32255.255.255.2550.0.0.0167,772,161Router loopback
10.0.0.210.0.0.2/32255.255.255.2550.0.0.0167,772,162Router ID
192.0.2.10192.0.2.10/32255.255.255.2550.0.0.03,221,225,994Load balancer VIP
198.51.100.25198.51.100.25/32255.255.255.2550.0.0.03,325,256,729Anycast DNS
203.0.113.5203.0.113.5/32255.255.255.2550.0.0.03,405,803,781Blackhole target
172.16.0.53172.16.0.53/32255.255.255.2550.0.0.02,886,729,781Internal DNS
100.64.0.1100.64.0.1/32255.255.255.2550.0.0.01,681,915,905CGNAT gateway
8.8.8.88.8.8.8/32255.255.255.2550.0.0.0134,744,072Public resolver

What is IPv4 /32 Host Route Calculator?

The IPv4 /32 Host Route Calculator is a tool that describes a single IPv4 address as a /32 prefix, the most specific route in IPv4.

A /32 prefix has 32 network bits and 0 host bits, so the block holds exactly 1 address. That address is the network, the host, and the end of the block at the same time. Routers use /32 entries for loopback interfaces, virtual IP addresses, and per-host traffic steering.

Longest prefix match always prefers a /32 over any shorter prefix. A /32 static route to a blackhole interface drops traffic to one address while the surrounding /24 keeps working.

What are the uses of IPv4 /32 Host Route Calculator?

There are 5 main uses of the IPv4 /32 Host Route Calculator, including loopback addressing, blackhole routing, and ACL host entries.

  • Assigning loopback addresses

    Router loopbacks use /32 addresses for stable router IDs in OSPF and BGP.

  • Advertising anycast services

    Anycast DNS and Content Delivery Network (CDN) nodes advertise the same /32 from many locations.

  • Blackholing attack traffic

    Remotely Triggered Black Hole (RTBH) routing announces a /32 to drop traffic aimed at one victim address.

  • Writing host-specific ACLs

    ACL entries such as permit host 192.0.2.10 use the /32 wildcard 0.0.0.0.

  • Steering single-host traffic

    Policy routes and VPN split-tunnel rules send one server through a specific path with a /32 entry.