$ run IPv4 Calculator
NetCalc by Alexmysterio — Mobile app coming soon · Telegram bot available

Enter runs the calculation · Shift+Enter inserts a new line

NETWORK TOOLBOX · 45 TOOLS

Network Toolbox

Find the right tool for any network value. Calculators and utilities for subnetting, IPv6, DNS, registry, Wi-Fi/RF, diagnostics and planning.

🤖 Open Telegram bot 📱 Mobile appComing soon
45toolsIPv4, IPv6, DNS, RF, Wi-Fi security and planning.
⌁Smart inputRecognizes IPs, CIDRs, MACs, ASNs, domains and ports and suggests related actions.
◫Data-awareLocal calculators do not send your data; online lookups make clear when external services are used.
Tools by category
IPv4 & Subnetting ToolsIPv4 calculators for subnetting, VLSM, CIDR, wildcard masks, ranges, ACLs, DHCP and address analysis.IPv6 ToolsIPv6 calculators for prefixes, normalization, planning, EUI-64, embedded IPv4 and reverse DNS.DNS, Registry & Lookup ToolsDNS, RDAP, ASN, MAC vendor, reverse-DNS and IP geolocation tools for network investigation.Wi-Fi & RF ToolsWi-Fi channel, frequency, FSPL, EIRP and secure WPA passphrase tools for wireless networks.Network Engineering ToolsMTU, MSS, VLAN, multicast, performance, ports, configuration and IP planning tools for network engineers.
Featured calculators and lookups
IPv4 CalculatorCalculate IPv4 networks, masks, broadcasts and usable host ranges.IPv6 CalculatorInspect IPv6 prefixes, address ranges, types and normalized addresses.VLSM CalculatorPlan variable-size IPv4 subnets without exceeding the base network.CIDR ConverterConvert CIDR prefixes, subnet masks, wildcard masks and host counts.MAC Vendor LookupIdentify MAC address manufacturers locally, including bulk lookup and multiple MAC formats.ASN LookupLook up ASN and network ownership information from an IP address or AS number.DNS LookupQuery common DNS records through DNS-over-HTTPS.Wi-Fi Channel and FrequencyConvert 2.4, 5 and 6 GHz Wi-Fi channels to center frequencies and show DFS or PSC planning hints.MTU and MSS CalculatorEstimate effective MTU and TCP MSS through common encapsulation stacks.RDAP LookupQuery registration data for IP addresses, autonomous systems and domains.
Technical resources
Networking GuidesPractical networking guides with worked examples, diagrams and links to the calculators used in each workflow.Learning PathsStructured routes through subnetting, IPv6, Wi-Fi, routing and Internet investigation, linking guides and calculators in a practical order.Networking Reference LabCompact, linkable networking reference tables for IPv4 CIDR, MTU overhead, Wi-Fi channels and IPv6 prefixes.Standards & RFCsCurated RFC, IANA, IEEE and Wi-Fi Alliance references used to validate the calculations and technical explanations in NetCalc.Networking GlossaryClear definitions of common networking terms, acronyms and concepts with direct links to relevant guides and tools.About NetCalcWho maintains NetCalc, what the project is for and how its networking tools are designed and reviewed.Methodology & SourcesHow calculations, reference data, standards and external lookups are selected, validated and documented in NetCalc.Alexmysterio — AuthorAbout Alexmysterio, the maintainer of NetCalc, including technical focus, editorial process and how networking content is reviewed.ChangelogMajor public changes to NetCalc tools, data sources, privacy behavior, SEO structure and reliability.Report an IssueReport calculation errors, documentation corrections or technical issues through the public Telegram bot without needing the maintainer’s personal account.
Common workflows
01
Design a networkVLSM → IP Planner → DHCP
 02
Diagnose addressingL2 check → overlap → ACL/ranges
 03
Analyze radioWi-Fi channels → FSPL → EIRP
 04
Investigate an IP or domainDNS → GeoIP → ASN → RDAP
Practical guides
MTU in tunnelsPPPoE · GRE · WireGuard · MSS VLSMSubnet plan step by step Wi-Fi 2.4 / 5 / 6 GHzChannels, DFS and PSC RDAP · ASN · GeoIPWhat each lookup means
user@netcalc ~/calc $

ipv4_calculator

Calculate network, broadcast, mask, hosts, class and binary for any IPv4 address

ip:
mask:
user@netcalc ~/calc $

ipv6_calculator

Calculate network info for IPv6 addresses in CIDR notation

ipv6:
pfx:
user@netcalc ~/calc $

vlsm_calculator

Variable Length Subnet Mask — assigns optimal blocks for each network segment

net:
pfx:
// Subnets required
name:
hosts:
name:
hosts:
name:
hosts:
user@netcalc ~/calc $

usable_ip_range

Shows the exact usable host range for a given network

ip:
mask:
user@netcalc ~/calc $

binary_ip_calc

Convert IP addresses to binary and vice versa, with per-octet visualization

dec:
bin:
user@netcalc ~/network $

cidr_converter

Convert between CIDR, decimal mask and wildcard. Includes full /1–/32 reference table.

in:
📋 CIDR Reference Table
CIDRSubnet MaskWildcardHosts/24 subnetsBlock
user@netcalc ~/network $

wildcard_mask_calc

Calculate the wildcard (inverse) mask for Cisco ACLs, OSPF and firewall rules

mask:
user@netcalc ~/network $

supernet_calculator

Find the minimum supernet containing all specified networks (route summarization)

nets:
user@netcalc ~/network $

subnet_splitter

Split a network into equal subnets by specifying a new prefix

net:
mask:
new:
user@netcalc ~/network $

range_to_cidr

Convert an IP range (start–end) to the minimum set of CIDR blocks

start:
end:
user@netcalc ~/network $

ip_to_integer

Convert IPv4/IPv6 addresses to integer and vice versa

ip:
int:
user@netcalc ~/network $

ipv6_normalize

Expand and compress IPv6 addresses — normalize any valid format

ipv6:
user@netcalc ~/network $

hex_ip_converter

Convert between hexadecimal and IP address — useful for Windows route tables and Cisco logs

ip:
0x:
user@netcalc ~/network $

vlan_calculator

802.1Q VLAN info: tag encoding, PCP, DEI, VID, range and compatibility

vlan:
pcp:
dei:
user@netcalc ~/dns $

reverse_dns_generator

Generate the PTR in-addr.arpa zone for an IPv4 network

net:
pfx:
dom:
user@netcalc ~/dns $

ipv6_ptr_generator

Generate the PTR ip6.arpa record for an IPv6 address

ipv6:
host:
user@netcalc ~/dns $

ip_geolocation

Locate a public IP or resolve a domain and geolocate its public address

Domains are resolved through DNS first; geolocation is based on the resulting public IP.
geo:
user@netcalc ~/dns $

ip_address_planner

Interactive IP address space planner — click cells to edit, export to CSV

📋 IP Address Plan
#NameNetworkMask/CIDRGatewayVLANLocationNotes
user@netcalc ~/legal $

Privacy

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Calculations

Calculations are sent through this site's same-origin Worker proxy to the private calculation service.

Performance metrics

LCP, CLS and INP may be stored as aggregate performance measurements by tool and language. Calculation inputs and persistent user identifiers are not included.

GeoIP

Only GeoIP lookups are processed by an external provider. The requested IP address is sent for that lookup.

Issue reports via Telegram

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