IPparse

Network Tools for Modern Engineers

120+ professional-grade calculators for subnetting, CIDR, DNS, TLS, and firewall workflows. All processing happens in your browser—your data never leaves your device.

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IPv4 Subnet Calculator

Calculate network, broadcast, and host range from CIDR notation

CIDR & Subnet Calculators

IPv6 Subnet Calculator

Calculate IPv6 prefix ranges and address boundaries

CIDR & Subnet Calculators

Netmask ↔ CIDR Converter

Convert between subnet mask notation and CIDR prefix length

CIDR & Subnet Calculators

Wildcard Mask Calculator

Calculate wildcard masks for ACLs and routing protocols

CIDR & Subnet Calculators

Network Address Calculator

Find the network address for any IP and subnet mask

CIDR & Subnet Calculators

Broadcast Address Calculator

Find the broadcast address for any subnet

CIDR & Subnet Calculators

First/Last Usable Host Calculator

Find the first and last usable host addresses in a subnet

CIDR & Subnet Calculators

Total Hosts Calculator

Calculate total number of addresses in a subnet (IPv4/IPv6)

CIDR & Subnet Calculators

Usable Hosts Calculator

Calculate number of usable host addresses in a subnet

CIDR & Subnet Calculators

Is IP in Subnet? Checker

Check if an IP address belongs to a specific subnet

CIDR & Subnet Calculators

Subnet Contains Subnet? Checker

Check if one CIDR block contains another

CIDR & Subnet Calculators

Subnet Overlap Checker (Two CIDRs)

Check if two CIDR blocks overlap

CIDR & Subnet Calculators

Subnet Overlap Checker (List vs List)

Find overlapping subnets between two lists

CIDR & Subnet Calculators

CIDR Normalizer

Normalize CIDR notation to canonical form

CIDR & Subnet Calculators

CIDR Sorter

Sort a list of CIDR blocks numerically (IPv4/IPv6 aware)

CIDR & Subnet Calculators

CIDR Deduper

Remove duplicate and contained CIDR blocks

CIDR & Subnet Calculators

Subnet Boundary Visualizer

Visualize subnet boundaries and bit alignment

CIDR & Subnet Calculators

Subnet Splitter (/x to /y)

Split a subnet into smaller subnets of a specific prefix

CIDR & Subnet Calculators

Subnet Splitter (N Equal Subnets)

Split a subnet into N equal-sized subnets

CIDR & Subnet Calculators

Subnet Splitter (Target Host Count)

Split a subnet to achieve a target host count per subnet

CIDR & Subnet Calculators

IP Range → CIDR Converter

Convert an IP range to minimal CIDR blocks

IP Range & CIDR Operations

CIDR → IP Range Converter

Convert CIDR notation to IP address range

IP Range & CIDR Operations

CIDR Aggregator

Aggregate multiple CIDR blocks into summarized routes

IP Range & CIDR Operations

CIDR Deaggregator

Expand a CIDR block into smaller blocks

IP Range & CIDR Operations

Smallest Covering CIDR (Two IPs)

Find the smallest CIDR that contains two IP addresses

IP Range & CIDR Operations

Smallest Covering CIDR (Two CIDRs)

Find the smallest CIDR that contains two CIDR blocks

IP Range & CIDR Operations

Smallest Covering CIDR (Many IPs/CIDRs)

Find the smallest CIDR containing a list of IPs or CIDRs

IP Range & CIDR Operations

Range Union

Merge overlapping IP ranges into a unified list

IP Range & CIDR Operations

Range Intersection

Find common addresses between two IP ranges

IP Range & CIDR Operations

Range Difference

Calculate A minus B for IP ranges

IP Range & CIDR Operations

CIDR Exclusion Tool

Subtract exception CIDRs from a parent block

IP Range & CIDR Operations

CIDR Gap Finder

Find unallocated gaps within a parent CIDR

IP Range & CIDR Operations

Next Available Subnet Finder

Find the next available subnet within a parent block

IP Range & CIDR Operations

Subnet Allocation Planner

Plan subnet allocations to fit requested blocks

IP Range & CIDR Operations

Adjacency Checker

Check if two CIDR blocks can be merged

IP Range & CIDR Operations

Minimal Merge Tool

Merge all mergeable CIDR blocks in a list

IP Range & CIDR Operations

IP List → Ranges

Compress consecutive IPs into ranges

IP Range & CIDR Operations

Range List → IP List

Expand IP ranges to individual IPs (with cap)

IP Range & CIDR Operations

CIDR List → Minimal Non-overlapping Set

Convert a CIDR list to minimal non-overlapping blocks

IP Range & CIDR Operations

Summarize Routes by Site/Tag

Group and summarize routes with tags

IP Range & CIDR Operations

VLSM Calculator

Calculate variable-length subnet masks from host requirements

VLSM & IP Planning

VLSM Report Generator

Generate printable VLSM allocation reports

VLSM & IP Planning

Address Plan Generator

Generate an IP address plan CSV template

VLSM & IP Planning

Subnet Naming Convention Builder

Build subnet names from environment/region/app

VLSM & IP Planning

VLAN-to-Subnet Mapper

Map VLANs to subnets with CSV input/output

VLSM & IP Planning

DHCP Scope Size Calculator

Calculate required DHCP scope size

VLSM & IP Planning

DHCP Exclusion Range Generator

Generate DHCP exclusion ranges for static IPs

VLSM & IP Planning

IP Reservation Table Builder

Build static IP assignment tables

VLSM & IP Planning

Duplicate Subnet Detector

Find duplicate subnets in an IP plan

VLSM & IP Planning

Duplicate IP Detector

Find duplicate IP assignments in a plan

VLSM & IP Planning

Overallocated Subnet Detector

Detect when required hosts exceed usable capacity

VLSM & IP Planning

Wasted Space Estimator

Calculate wasted address space in allocations

VLSM & IP Planning

Change Impact Report

See what overlaps if a new subnet is added

VLSM & IP Planning

Subnet Plan Diff

Compare old vs new subnet plans

VLSM & IP Planning

IPAM Import Formatter

Format data for IPAM system imports

VLSM & IP Planning

IPv4 Validator

Validate IPv4 addresses in strict dotted-quad format

IP Representation & Validation

IPv6 Validator

Validate IPv6 addresses (full and compressed formats)

IP Representation & Validation

IPv6 Expand ↔ Compress

Convert between expanded and compressed IPv6 notation

IP Representation & Validation

IPv4 ↔ Integer Converter

Convert IPv4 addresses to/from 32-bit integers

IP Representation & Validation

IPv6 ↔ BigInt Converter

Convert IPv6 addresses to/from 128-bit integers

IP Representation & Validation

IPv4 ↔ Binary Converter

Convert IPv4 addresses to/from binary notation

IP Representation & Validation

IPv6 ↔ Binary Converter

Convert IPv6 addresses to/from binary notation

IP Representation & Validation

IPv4 ↔ Hex Converter

Convert IPv4 addresses to/from hexadecimal

IP Representation & Validation

IPv4 Private/Public Detector

Detect if IPv4 is private, public, or special

IP Representation & Validation

IPv6 Unique Local/Link-Local Detector

Detect IPv6 address scope and type

IP Representation & Validation

IPv4-Mapped IPv6 Converter

Convert between IPv4 and IPv4-mapped IPv6 (::ffff:)

IP Representation & Validation

6to4 Address Builder/Parser

Build or parse 6to4 tunnel addresses

IP Representation & Validation

Address Family Detector

Detect if an address is IPv4, IPv6, or invalid

IP Representation & Validation

Normalize Mixed Lists

Sort and clean mixed IPv4/IPv6 address lists

IP Representation & Validation

Extract IPs from Text

Extract IP addresses from logs or text snippets

IP Representation & Validation

Hostname Validator

Validate hostnames per RFC standards

DNS & Domain Operations

FQDN Validator

Validate fully qualified domain names

DNS & Domain Operations

URL → Hostname Extractor

Extract hostnames from URLs in bulk

DNS & Domain Operations

Root Domain Extractor

Extract root domain using Public Suffix List

DNS & Domain Operations

Subdomain Extractor

Extract subdomains from hostnames in bulk

DNS & Domain Operations

Reverse PTR Name Builder (IPv4)

Build in-addr.arpa PTR names from IPv4 addresses

DNS & Domain Operations

Reverse PTR Name Builder (IPv6)

Build ip6.arpa PTR names from IPv6 addresses

DNS & Domain Operations

BIND Zone A/AAAA Generator

Generate BIND zone A and AAAA records from CSV

DNS & Domain Operations

BIND Zone CNAME Generator

Generate BIND zone CNAME records from CSV

DNS & Domain Operations

Zone File Linter

Check zone files for syntax errors and duplicates

DNS & Domain Operations

SPF Record Builder

Build SPF records with proper syntax

DNS & Domain Operations

SPF Record Length Checker

Check SPF record length and lookup limits

DNS & Domain Operations

DKIM TXT Record Formatter

Format DKIM records with proper quoting

DNS & Domain Operations

DMARC Record Builder

Build DMARC records with all policy tags

DNS & Domain Operations

DNS Record Set Deduper

Find and remove duplicate DNS records

DNS & Domain Operations

Port Validator

Validate port numbers (0-65535)

Ports, URLs & HTTP Helpers

Port List Expander

Expand port ranges to individual ports

Ports, URLs & HTTP Helpers

Port List Compressor

Compress port lists into ranges

Ports, URLs & HTTP Helpers

Protocol/Port Template Builder

Build firewall rules from CSV templates

Ports, URLs & HTTP Helpers

URL Parser

Parse URLs into scheme, host, port, path, and query

Ports, URLs & HTTP Helpers

URL Normalizer

Normalize URLs by removing defaults and sorting params

Ports, URLs & HTTP Helpers

Query String Parser/Builder

Parse and build URL query strings

Ports, URLs & HTTP Helpers

Bulk Add/Remove Query Params

Add or remove query parameters from multiple URLs

Ports, URLs & HTTP Helpers

HTTP Header Formatter

Convert between raw and key/value header formats

Ports, URLs & HTTP Helpers

Cookie Header Parser

Parse Cookie and Set-Cookie headers

Ports, URLs & HTTP Helpers

CORS Header Explainer

Understand CORS headers and check configurations

Ports, URLs & HTTP Helpers

HTTP Status Code Lookup

Look up HTTP status code meanings offline

Ports, URLs & HTTP Helpers

MIME Type Lookup

Look up MIME types by file extension

Ports, URLs & HTTP Helpers

User-Agent Parser

Parse user agent strings into components

Ports, URLs & HTTP Helpers

curl Command Builder

Build curl commands from method, headers, and body

Ports, URLs & HTTP Helpers

X.509 Certificate Viewer

View X.509 certificate details from PEM

TLS/Certs & Key Utilities

Certificate Fingerprint Generator

Generate SHA-256 and SHA-1 certificate fingerprints

TLS/Certs & Key Utilities

Certificate Expiry Checker

Check certificate expiry and days remaining

TLS/Certs & Key Utilities

PEM Bundle Splitter

Split a PEM bundle into individual certificates

TLS/Certs & Key Utilities

PEM Bundle Merger

Merge multiple PEM certificates into a bundle

TLS/Certs & Key Utilities

CSR Viewer

View Certificate Signing Request details

TLS/Certs & Key Utilities

Public Key Extractor

Extract public key from certificate or CSR

TLS/Certs & Key Utilities

SAN Extractor

Extract Subject Alternative Names from certificates

TLS/Certs & Key Utilities

Convert DER ↔ PEM

Convert between DER and PEM certificate formats

TLS/Certs & Key Utilities

TLS Config Snippet Builder

Generate TLS configuration snippets for nginx/Apache

TLS/Certs & Key Utilities

Allowlist Builder

Build minimal CIDR allowlist from IP list

Firewall/ACL Workflows

Blocklist Builder

Build minimal CIDR blocklist from IP list

Firewall/ACL Workflows

IP:Port Allowlist Validator

Validate bulk IP:port entries

Firewall/ACL Workflows

CIDR Allow/Deny Snippet Generator (nginx)

Generate nginx allow/deny directives from CIDR list

Firewall/ACL Workflows

Apache Require ip Snippet Generator

Generate Apache Require ip directives

Firewall/ACL Workflows

iptables Rule Generator

Generate iptables rules from CSV

Firewall/ACL Workflows

nftables Rule Generator

Generate nftables rules from CSV

Firewall/ACL Workflows

AWS Security Group Rule Generator

Generate AWS Security Group rules from CSV

Firewall/ACL Workflows

Azure NSG Rule Generator

Generate Azure NSG rules from CSV

Firewall/ACL Workflows

Rule Conflict Finder

Find duplicate, shadowed, or overlapping firewall rules

Firewall/ACL Workflows
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IPparse•Free Network & Subnet Calculator Tools

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