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IP Range CalculatorPRO
Diagnostics, Generators & UtilitiesInstant Client-Side Tool

IP Range Comparison Tool

Compare two address-set lists.

IP Range Comparison Tool: 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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How IP Range Comparison Tool Works?

This tool works by splitting 2 address-set lists into 3 groups: addresses only in list A, addresses only in list B, and addresses in both.

  1. Paste list A

    Enter the first set of addresses, ranges, or prefixes.

  2. Paste list B

    Enter the second set.

  3. Merge and compare

    Each list is merged, then the tool computes A − B, B − A, and A ∩ B.

  4. Report the 3 groups

    Each group appears as CIDR blocks with an address count.

IP Range Comparison Tool Formula

The formula is Only A = A − B, Only B = B − A, and Both = A ∩ B.

Only in A

A − B

Present in A, missing from B.

Only in B

B − A

Present in B, missing from A.

In both

A ∩ B

Shared addresses.

Match ratio

|A ∩ B| ÷ |A ∪ B| × 100 %

Similarity of the 2 lists.

Worked example: 2 lists of 4 prefixes

A: 10.0.0.0/24, 10.0.1.0/24, 192.168.5.0/25, 172.16.0.0/22
B: 10.0.1.0/24, 10.0.2.0/24, 192.168.5.0/24, 172.16.2.0/23
Only A = 768  Only B = 384  Both = 896

IP Range Comparison Tool Conversion Table

The table shows the 3 comparison groups for the 2 lists in the worked example.

GroupCIDR BlocksAddresses
Only in A10.0.0.0/24, 172.16.0.0/23768
Only in B10.0.2.0/24, 192.168.5.128/25384
In both10.0.1.0/24, 172.16.2.0/23, 192.168.5.0/25896

What is IP Range Comparison Tool?

The IP Range Comparison Tool is a tool that compares 2 lists of IP addresses and ranges and shows what each list has that the other lacks.

Line-by-line diff tools fail on address lists. 192.168.5.0/24 in 1 list and 192.168.5.0/25 plus 192.168.5.128/25 in the other look different but cover the same space. The comparison tool works on the addresses themselves, not on the text.

The result answers questions such as "which networks does the firewall allow that the documentation does not list" in 1 step.

What are the uses of IP Range Comparison Tool?

There are 4 main uses of the IP Range Comparison Tool, including config-versus-documentation checks, environment parity, and vendor list reviews.

  • Comparing config with documentation

    Firewall objects are compared with the approved address list.

  • Checking environment parity

    Staging and production allow-lists are compared for drift.

  • Reviewing vendor list updates

    A vendor's new list is compared with the copy already deployed.

  • Reconciling 2 IPAM sources

    Records from 2 IPAM tools are compared before a merge.