Network Tools & Subnet Calculators
A comprehensive suite of client-side IP range calculators, prefix planners, CIDR converters, mask validators, and network architecture analyzers.
IPv4 Subnetting & Range
35 toolsIPv4 Range Calculator
Find address boundaries from a prefix.
IPv4 Subnet Calculator
Calculate subnet details from address and mask.
Network Address Calculator
Find the subnet’s network address.
IPv4 Broadcast Address Calculator
Find broadcast addresses where applicable.
First and Last Address Calculator
Identify a range’s endpoints.
Usable IPv4 Host Range Calculator
Apply the selected subnet-use rules.
Total Address Count Calculator
Count addresses within a prefix.
Usable Host Count Calculator
Account for applicable address reservations.
Host Bits Calculator
Calculate bits available within a prefix.
Network Bits Calculator
Identify the network prefix length.
Host Requirement to Prefix Calculator
Find a prefix meeting capacity requirements.
Prefix to Host Capacity Calculator
Calculate capacity for a specified prefix.
IPv4 /31 Link Calculator
Apply point-to-point addressing rules.
IPv4 /32 Host Route Calculator
Calculate single-address IPv4 prefix details.
CIDR Validator
Check address and prefix syntax.
IP Range Validator
Check endpoints and address-family consistency.
CIDR Canonicalizer
Normalize prefixes to network boundaries.
Mixed IP Input Parser
Interpret addresses, prefixes, masks, and ranges.
Network and Host ID Calculator
Separate prefix and host portions.
Nth Address Calculator
Find an address by range offset.
Address Index Calculator
Find an address’s position within a range.
Next Subnet Calculator
Find the following same-sized subnet.
Previous Subnet Calculator
Find the preceding same-sized subnet.
Subnet Count Calculator
Count child prefixes within a parent.
Required Subnet Prefix Calculator
Determine prefix length for subnet quantity.
Smallest Covering CIDR Calculator
Find one prefix covering a range.
CIDR Coverage Gap Calculator
Identify uncovered addresses between allocations.
Prefix Expansion Calculator
List child prefixes at a selected length.
Special-Purpose Address Classifier
Use a selected address registry snapshot.
Legacy IPv4 Class Identifier
Explain historical classful address categories.
Static Address Reservation Planner
Allocate entered static address reservations.
Gateway Address Validator
Check an entered gateway against subnet rules.
Free Address Range Finder
Find gaps in entered allocation records.
Next Available Subnet Finder
Find aligned space within a parent.
Longest Prefix Match Calculator
Find the most specific matching route.
IPv6 Tools
15 toolsIPv6 Range Calculator
Find IPv6 prefix boundaries.
IPv6 Subnet Calculator
Calculate prefix details and address counts.
IPv6 /127 Link Planner
Divide a parent prefix into address pairs.
IPv6 /128 Address Calculator
Calculate single-address IPv6 prefix details.
IP Address Validator
Check IPv4 or IPv6 address syntax.
IPv6 Binary Converter
Display address bits.
IPv6 Integer Converter
Convert IPv6 addresses to integer values.
IPv6 Address Expander
Restore omitted hexadecimal groups.
IPv6 Address Compressor
Shorten address notation.
IPv4-Mapped IPv6 Converter
Construct or decode mapped addresses.
IPv6 Subnet ID Calculator
Identify subnet bits within a parent.
IPv6 Prefix Allocation Planner
Allocate child prefixes by requested sizes.
IPv6 Prefix Capacity Calculator
Count available child subnets.
IPv6 Address Type Classifier
Identify architectural address types.
IPv6 Reverse DNS Name Generator
Generate nibble-format reverse lookup names.
Conversion & Encoding
6 toolsCIDR to IP Range Converter
Convert prefixes into start–end ranges.
IP Range to CIDR Converter
Find exact covering CIDR blocks.
IPv4 Binary Converter
Convert addresses to binary.
IPv4 Decimal Integer Converter
Convert IPv4 addresses to integer values.
Integer to IPv4 Converter
Convert integer values to addresses.
IPv4 Hexadecimal Converter
Convert addresses to hexadecimal.
Masks, Wildcards & ACL
9 toolsIP Address and Mask Calculator
Calculate the corresponding network range.
CIDR to Subnet Mask Converter
Convert IPv4 prefixes to dotted masks.
Subnet Mask to CIDR Converter
Find prefix length from contiguous masks.
Subnet Mask Validator
Check mask structure and contiguity.
Subnet Mask to Wildcard Converter
Calculate the inverse IPv4 mask.
Wildcard Mask to Subnet Mask Converter
Convert compatible contiguous wildcard masks.
ACL Wildcard Match Calculator
Evaluate address-and-wildcard matching.
ACL Wildcard to CIDR Converter
Express matching addresses as CIDR blocks.
ACL Address Match Tester
Test an address against supplied rules.
Subnet Math & Set Operations
23 toolsBitwise Subnet Calculator
Show address-and-mask operations.
IP Address Offset Calculator
Add or subtract address positions.
Address Distance Calculator
Count positions between two addresses.
Subnet Boundary Checker
Check alignment to a specified prefix.
IP-in-Range Checker
Test whether an address belongs.
IP-in-Subnet Checker
Test membership within a CIDR block.
Same Subnet Checker
Compare addresses under a selected mask.
Subnet Containment Checker
Test whether one subnet contains another.
Range Overlap Checker
Detect intersecting address ranges.
CIDR Overlap Checker
Detect overlapping network prefixes.
Range Intersection Calculator
Find addresses shared between ranges.
Range Union Calculator
Combine address sets.
Range Difference Calculator
Remove one address set from another.
Range Complement Calculator
Find unallocated addresses within a parent.
Adjacent Range Checker
Identify directly neighboring ranges.
IP Range Merger
Combine overlapping or adjacent intervals.
IP Range Splitter
Divide a range at selected boundaries.
Equal Subnet Splitter
Divide a network into equal prefixes.
Private IPv4 Range Checker
Check membership in private address blocks.
Duplicate Allocation Checker
Find repeated addresses or overlapping allocations.
Multi-Cloud CIDR Overlap Checker
Compare entered cloud network allocations.
VPN Network Overlap Checker
Compare local and remote address spaces.
Subnetting Answer Checker
Check calculated ranges and masks.
Planning, VLSM & Cloud
19 toolsVLSM Calculator
Allocate differently sized subnets.
VLSM Allocation Validator
Check alignment, capacity, and overlaps.
Supernet Calculator
Find a covering parent prefix.
Exact CIDR Aggregator
Merge prefixes without adding addresses.
Route Summary Calculator
Summarize networks and identify included gaps.
DHCP Scope Calculator
Plan allocation boundaries within a subnet.
DHCP Exclusion Calculator
Remove specified addresses and ranges.
DHCP Pool Capacity Calculator
Count addresses available after exclusions.
VLAN Subnet Planner
Assign prefixes to requested VLAN capacities.
Site Address Allocation Planner
Divide a parent range across sites.
Address Growth Headroom Calculator
Reserve capacity for planned expansion.
Subnet Utilization Calculator
Compare recorded allocations with available capacity.
Allocation Fragmentation Analyzer
Identify scattered free address blocks.
AWS VPC Subnet Capacity Calculator
Account for AWS address reservations.
Custom Cloud Subnet Calculator
Apply entered provider reservation rules.
Routing Table Coverage Analyzer
Compare entered routes with target ranges.
Firewall CIDR List Optimizer
Consolidate equivalent address sets.
Firewall Address Exclusion Calculator
Subtract exceptions from allowed ranges.
Address Allocation Map Generator
Visualize occupied and available blocks.
Diagnostics, Generators & Utilities
17 toolsIPv4 Reverse DNS Name Generator
Generate address-level reverse lookup names.
Reverse DNS Zone Planner
Identify applicable reverse delegation boundaries.
Bounded IP Address List Generator
Enumerate a selected, limited address range.
Random Address Sampler
Sample addresses within supplied ranges.
Batch Subnet Calculator
Calculate details for multiple prefixes.
IP List Deduplicator
Remove repeated addresses.
IP Address Sorter
Sort addresses numerically.
Mixed Range Normalizer
Standardize addresses, intervals, and prefixes.
IP Range Comparison Tool
Compare two address-set lists.
IP Range Change Analyzer
Identify added and removed addresses.
Subnet Table Generator
Create a structured addressing reference.
Network Hierarchy Visualizer
Show parent and child prefix relationships.
Subnetting Step Explainer
Show binary and prefix calculations.
Subnetting Practice Generator
Create address-planning exercises.
IP Plan Importer
Load existing address allocation records.
IP Plan Exporter
Export ranges, prefixes, and allocation details.
IP Range Report Generator
Summarize inputs, calculations, and assumptions.
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