user@netcalc ~/calc $
ipv4_calculator
Calculate network, broadcast, mask, hosts, class and binary for any IPv4 address
ip:
mask:
✓ stdout — ipv4_calculator
NetCalc · project information
Networking Glossary
Clear definitions of common networking terms, acronyms and concepts with direct links to relevant guides and tools.
Enter runs the calculation · Shift+Enter inserts a new line
user@netcalc ~/calc $
ipv6_calculator
Calculate network info for IPv6 addresses in CIDR notation
ipv6:
pfx:
✓ stdout — ipv6_calculator
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:
✓ stdout — vlsm_calculator
| # | Name | Hosts Req | Hosts Avail | Prefix | Network | First Host | Last Host | Broadcast | Mask |
|---|
user@netcalc ~/calc $
usable_ip_range
Shows the exact usable host range for a given network
ip:
mask:
✓ stdout — usable_ip_range
user@netcalc ~/calc $
binary_ip_calc
Convert IP addresses to binary and vice versa, with per-octet visualization
dec:
bin:
✓ stdout — binary_ip_calc
user@netcalc ~/network $
cidr_converter
Convert between CIDR, decimal mask and wildcard. Includes full /1–/32 reference table.
in:
✓ stdout — cidr_converter
📋 CIDR Reference Table
| CIDR | Subnet Mask | Wildcard | Hosts | /24 subnets | Block |
|---|
user@netcalc ~/network $
wildcard_mask_calc
Calculate the wildcard (inverse) mask for Cisco ACLs, OSPF and firewall rules
mask:
✓ stdout — wildcard_mask_calc
user@netcalc ~/network $
supernet_calculator
Find the minimum supernet containing all specified networks (route summarization)
nets:
✓ stdout — supernet_calculator
user@netcalc ~/network $
subnet_splitter
Split a network into equal subnets by specifying a new prefix
net:
mask:
new:
✓ stdout — subnet_splitter
| # | Network | First Host | Last Host | Broadcast | Hosts | Mask |
|---|
user@netcalc ~/network $
range_to_cidr
Convert an IP range (start–end) to the minimum set of CIDR blocks
start:
end:
✓ stdout — range_to_cidr
| # | CIDR Block | Network | Broadcast | Hosts |
|---|
user@netcalc ~/network $
ip_to_integer
Convert IPv4/IPv6 addresses to integer and vice versa
ip:
int:
✓ stdout — ip_to_integer
user@netcalc ~/network $
ipv6_normalize
Expand and compress IPv6 addresses — normalize any valid format
ipv6:
✓ stdout — ipv6_normalize
user@netcalc ~/network $
hex_ip_converter
Convert between hexadecimal and IP address — useful for Windows route tables and Cisco logs
ip:
0x:
✓ stdout — hex_ip_converter
user@netcalc ~/network $
vlan_calculator
802.1Q VLAN info: tag encoding, PCP, DEI, VID, range and compatibility
vlan:
pcp:
dei:
✓ stdout — vlan_calculator
user@netcalc ~/dns $
reverse_dns_generator
Generate the PTR in-addr.arpa zone for an IPv4 network
net:
pfx:
dom:
✓ stdout — reverse_dns_generator
user@netcalc ~/dns $
ipv6_ptr_generator
Generate the PTR ip6.arpa record for an IPv6 address
ipv6:
host:
✓ stdout — ipv6_ptr_generator
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:
✓ stdout — ip_geolocation
user@netcalc ~/dns $
ip_address_planner
Interactive IP address space planner — click cells to edit, export to CSV
📋 IP Address Plan
| # | Name | Network | Mask/CIDR | Gateway | VLAN | Location | Notes |
|---|
user@netcalc ~/legal $
Privacy
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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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Cookies and advertising
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This page provides operational information; it is not a legal-compliance certification.
Concepts used throughout the toolbox
The glossary explains the operational meaning of terms used by the tools; it does not replace formal specifications. Definitions stay intentionally concise so you can jump from a term into a guide or standard.
ASN
Autonomous System NumberIdentifies an autonomous routing domain on the public Internet; it describes routing context, not a person or website owner.
BGP
Border Gateway ProtocolThe inter-domain routing protocol used to exchange reachability between autonomous systems.
CIDR
Classless Inter-Domain RoutingPrefix notation such as /24 or /56 that represents how many leading bits identify the network portion.
DFS
Dynamic Frequency SelectionWi-Fi mechanism that requires some 5 GHz channels to detect radar and vacate the channel when necessary.
DHCP
Dynamic Host Configuration ProtocolProtocol that supplies clients with addresses and options such as gateway, DNS and lease lifetime.
EIRP
Equivalent Isotropically Radiated PowerTransmit power after antenna gain and relevant losses, expressed as an equivalent isotropic radiated level.
FSPL
Free-Space Path LossIdeal propagation loss between two points in free space as a function of distance and frequency.
MSS
TCP Maximum Segment SizeMaximum TCP payload a peer advertises it can receive in one segment, excluding IP/TCP headers.
MTU
Maximum Transmission UnitLargest layer-3 packet an interface or path element can carry without needing a smaller representation.
NAT
Network Address TranslationTechnique that rewrites addresses and sometimes ports as traffic crosses a boundary.
OUI
Organizationally Unique IdentifierIEEE registration prefix traditionally used to associate the first MAC bits with an organization.
PMTUD
Path MTU DiscoveryProcess by which endpoints learn the smallest usable MTU along an end-to-end path.
PSC
Preferred Scanning ChannelSelected 6 GHz Wi-Fi channels intended to make active scanning and AP discovery more efficient.
RDAP
Registration Data Access ProtocolStructured protocol used to retrieve registration information for domains, IP networks and autonomous systems.
SLAAC
Stateless Address AutoconfigurationIPv6 mechanism that lets hosts construct addresses using Router Advertisements without a stateful address lease.
SNR
Signal-to-Noise RatioDifference between received signal level and noise floor; a key indicator of radio link quality.
VLAN
Virtual LAN / IEEE 802.1QLogical layer-2 broadcast domain commonly identified by an IEEE 802.1Q VLAN ID.
Wildcard
Inverse matching maskBit mask where zero means “must match” and one means “may vary” in classic ACL/routing matching syntax.
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