Free practical tools
Subnet, CIDR, DNS, bandwidth, latency, port, uptime, and infrastructure planning tools.
Enter values, run the tool, copy the result. Built for network admins, developers, IT support teams, and sysadmins.
All tools
Choose a tool
CIDR Host Calculator
Calculate usable hosts from CIDR prefix.
IPSubnet Mask Calculator
Convert CIDR prefix to subnet mask.
IPIP Range Size Calculator
Calculate range size from start and end last octet.
IPVLSM Quick Planner
Estimate prefix for required hosts.
DNSDNS TTL Converter
Convert TTL seconds to minutes and hours.
DNSDNS Propagation Window
Estimate propagation wait window.
BandwidthDownload Time Calculator
Estimate download time from file size and bandwidth.
BandwidthUpload Time Calculator
Estimate upload time.
BandwidthData Transfer Calculator
Estimate monthly data transfer.
BandwidthLatency Distance Estimator
Estimate minimum round-trip latency by distance.
OpsPacket Loss Percentage
Calculate packet loss percentage.
OpsUptime Percentage Calculator
Calculate uptime percentage.
OpsDowntime Budget Calculator
Calculate allowed downtime from SLA.
OpsPort Range Size Calculator
Calculate number of ports in a range.
OpsNAT Session Estimator
Estimate NAT sessions per user.
IPDHCP Scope Usage
Calculate DHCP scope usage.
BandwidthWi-Fi Capacity Estimator
Estimate users per access point.
OpsBackup Window Calculator
Estimate backup time.
OpsLog Storage Calculator
Estimate log storage needs.
OpsHTTP Status Class Lookup
Classify HTTP status code.
IPAdvanced CIDR Host Calculator
Calculate usable hosts from CIDR prefix. This focused variant is tuned for advanced planning and long-tail workflow searches.
IPQuick Subnet Mask Calculator
Convert CIDR prefix to subnet mask. This focused variant is tuned for quick planning and long-tail workflow searches.
IPPlanning IP Range Size Calculator
Calculate range size from start and end last octet. This focused variant is tuned for planning planning and long-tail workflow searches.
IPMobile VLSM Quick Planner
Estimate prefix for required hosts. This focused variant is tuned for mobile planning and long-tail workflow searches.
DNSSmall Business DNS TTL Converter
Convert TTL seconds to minutes and hours. This focused variant is tuned for small business planning and long-tail workflow searches.
DNSFamily DNS Propagation Window
Estimate propagation wait window. This focused variant is tuned for family planning and long-tail workflow searches.
BandwidthTeam Download Time Calculator
Estimate download time from file size and bandwidth. This focused variant is tuned for team planning and long-tail workflow searches.
BandwidthTravel Upload Time Calculator
Estimate upload time. This focused variant is tuned for travel planning and long-tail workflow searches.
BandwidthAudit Data Transfer Calculator
Estimate monthly data transfer. This focused variant is tuned for audit planning and long-tail workflow searches.
BandwidthChecklist Latency Distance Estimator
Estimate minimum round-trip latency by distance. This focused variant is tuned for checklist planning and long-tail workflow searches.
OpsBudget Packet Loss Percentage
Calculate packet loss percentage. This focused variant is tuned for budget planning and long-tail workflow searches.
OpsWeekly Uptime Percentage Calculator
Calculate uptime percentage. This focused variant is tuned for weekly planning and long-tail workflow searches.
IP
IP tools
CIDR Host Calculator
Calculate usable hosts from CIDR prefix.
IPSubnet Mask Calculator
Convert CIDR prefix to subnet mask.
IPIP Range Size Calculator
Calculate range size from start and end last octet.
IPVLSM Quick Planner
Estimate prefix for required hosts.
IPDHCP Scope Usage
Calculate DHCP scope usage.
IPAdvanced CIDR Host Calculator
Calculate usable hosts from CIDR prefix. This focused variant is tuned for advanced planning and long-tail workflow searches.
IPQuick Subnet Mask Calculator
Convert CIDR prefix to subnet mask. This focused variant is tuned for quick planning and long-tail workflow searches.
IPPlanning IP Range Size Calculator
Calculate range size from start and end last octet. This focused variant is tuned for planning planning and long-tail workflow searches.
IPMobile VLSM Quick Planner
Estimate prefix for required hosts. This focused variant is tuned for mobile planning and long-tail workflow searches.
DNS
DNS tools
DNS TTL Converter
Convert TTL seconds to minutes and hours.
DNSDNS Propagation Window
Estimate propagation wait window.
DNSSmall Business DNS TTL Converter
Convert TTL seconds to minutes and hours. This focused variant is tuned for small business planning and long-tail workflow searches.
DNSFamily DNS Propagation Window
Estimate propagation wait window. This focused variant is tuned for family planning and long-tail workflow searches.
Bandwidth
Bandwidth tools
Download Time Calculator
Estimate download time from file size and bandwidth.
BandwidthUpload Time Calculator
Estimate upload time.
BandwidthData Transfer Calculator
Estimate monthly data transfer.
BandwidthLatency Distance Estimator
Estimate minimum round-trip latency by distance.
BandwidthWi-Fi Capacity Estimator
Estimate users per access point.
BandwidthTeam Download Time Calculator
Estimate download time from file size and bandwidth. This focused variant is tuned for team planning and long-tail workflow searches.
BandwidthTravel Upload Time Calculator
Estimate upload time. This focused variant is tuned for travel planning and long-tail workflow searches.
BandwidthAudit Data Transfer Calculator
Estimate monthly data transfer. This focused variant is tuned for audit planning and long-tail workflow searches.
BandwidthChecklist Latency Distance Estimator
Estimate minimum round-trip latency by distance. This focused variant is tuned for checklist planning and long-tail workflow searches.
Ops
Ops tools
Packet Loss Percentage
Calculate packet loss percentage.
OpsUptime Percentage Calculator
Calculate uptime percentage.
OpsDowntime Budget Calculator
Calculate allowed downtime from SLA.
OpsPort Range Size Calculator
Calculate number of ports in a range.
OpsNAT Session Estimator
Estimate NAT sessions per user.
OpsBackup Window Calculator
Estimate backup time.
OpsLog Storage Calculator
Estimate log storage needs.
OpsHTTP Status Class Lookup
Classify HTTP status code.
OpsBudget Packet Loss Percentage
Calculate packet loss percentage. This focused variant is tuned for budget planning and long-tail workflow searches.
OpsWeekly Uptime Percentage Calculator
Calculate uptime percentage. This focused variant is tuned for weekly planning and long-tail workflow searches.
Guides
Short practical guides
How to choose the right network admin tools
Pick the fastest tool for the job and avoid common input mistakes.
GuideCommon mistakes with network admin tools
Review units, assumptions, formats, and edge cases before using results.
GuideWhy browser-based tools are useful
Use lightweight tools for fast calculations, formatting, and planning without account setup.