ipv4_calculator
Calculate network, broadcast, mask, hosts, class and binary for any IPv4 address
Enter runs the calculation · Shift+Enter inserts a new line
Calculate network, broadcast, mask, hosts, class and binary for any IPv4 address
Calculate network info for IPv6 addresses in CIDR notation
Variable Length Subnet Mask — assigns optimal blocks for each network segment
| # | Name | Hosts Req | Hosts Avail | Prefix | Network | First Host | Last Host | Broadcast | Mask |
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Shows the exact usable host range for a given network
Convert IP addresses to binary and vice versa, with per-octet visualization
Convert between CIDR, decimal mask and wildcard. Includes full /1–/32 reference table.
| CIDR | Subnet Mask | Wildcard | Hosts | /24 subnets | Block |
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Calculate the wildcard (inverse) mask for Cisco ACLs, OSPF and firewall rules
Find the minimum supernet containing all specified networks (route summarization)
Split a network into equal subnets by specifying a new prefix
| # | Network | First Host | Last Host | Broadcast | Hosts | Mask |
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Convert an IP range (start–end) to the minimum set of CIDR blocks
| # | CIDR Block | Network | Broadcast | Hosts |
|---|
Convert IPv4/IPv6 addresses to integer and vice versa
Expand and compress IPv6 addresses — normalize any valid format
Convert between hexadecimal and IP address — useful for Windows route tables and Cisco logs
802.1Q VLAN info: tag encoding, PCP, DEI, VID, range and compatibility
Generate the PTR in-addr.arpa zone for an IPv4 network
Generate the PTR ip6.arpa record for an IPv6 address
Locate a public IP or resolve a domain and geolocate its public address
Interactive IP address space planner — click cells to edit, export to CSV
| # | Name | Network | Mask/CIDR | Gateway | VLAN | Location | Notes |
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Calculations are sent through this site's same-origin Worker proxy to the private calculation service.
LCP, CLS and INP may be stored as aggregate performance measurements by tool and language. Calculation inputs and persistent user identifiers are not included.
Only GeoIP lookups are processed by an external provider. The requested IP address is sent for that lookup.
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Advertising is controlled by the production configuration. When Google AdSense is enabled, consent is handled through a certified CMP before personalized advertising is used where required.
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This page provides operational information; it is not a legal-compliance certification.
Planifica gateways, reservas, rangos dinámicos y crecimiento dentro de una subred IPv4 sin colisiones de direcciones.
Reserva una zona documentada para gateways, switches, AP, servidores y otra infraestructura estática antes de definir el pool dinámico. La convención exacta importa menos que mantenerla coherente.
Una subred con suficientes direcciones sobre el papel puede agotarse si los leases son largos y se acumulan clientes temporales. Considera concurrencia normal, rotación de invitados y crecimiento.
Las reservas estáticas, exclusiones y el rango dinámico deben ser fáciles de auditar. Si existen varios servidores DHCP o pares de failover, deja claro qué rango gestiona cada uno.
Un scope DHCP es más que un rango inicio/fin. Registra gateway, DNS, dominio/search, duración de lease y cualquier opción específica que necesiten los clientes.
Si DHCP es crítico decide si necesitas failover, split scope o servidores redundantes. El diseño debe definir quién posee los leases y cómo se comporta el secundario durante una partición, no simplemente colocar dos servidores independientes en la misma VLAN.
Sigue leases activos, direcciones libres, eventos decline/conflict y rotación. Un scope que se aproxima de forma habitual a su capacidad de pico debe investigarse antes de que aparezcan fallos intermitentes de “sin dirección”. El umbral útil depende de la rotación y tiempo de recuperación.
Un DHCP rogue o mal configurado puede ser más disruptivo que agotar el pool. En redes gestionadas, DHCP snooping y uplinks confiables pueden limitar desde dónde se aceptan respuestas y los logs ayudan a localizar el puerto problemático.