Free ISP Engineering Tools & Calculators Hub
Free ISP Engineering & Planning Tools
Precision planning tools for WISPs and fiber operators — RF, optical, power, addressing, and business math. No sign-up required.
Link Budget Calculator
Calculate FSPL, RSSI, and EIRP for wireless links (2.4GHz to 60GHz).
Tower Revenue Calculator
Analyze ISP tower profitability, CAPEX/OPEX, and business Break-Even Point.
GPON Splitter Calculator
Plan optical budgets for PON networks. Calculate splitter and fiber loss.
UPS Runtime Calculator
Estimate battery backup time based on load (Watts) and battery capacity (Ah).
IPv4 Subnet Calculator
CIDR to Subnet Mask, Network Address, Broadcast, and Host Range calculator.
CGNAT Calculator
Plan Carrier-Grade NAT: subscribers per public IPv4, port blocks, and pool capacity.
Data & Bandwidth Converter
Convert Mbps to Gbps, MB to GB, bits to bytes, plus a download time calculator.
Bandwidth Calculator
Plan oversubscription ratios and total backhaul capacity requirements.
ROI Comparison
Compare Kashtrix costs vs legacy platforms (Splynx/Sonar). See how much you can save.
SLA Uptime Calculator
Convert SLA uptime percentages (99.9%) to allowable downtime limits.
MAC Address Lookup
Find the hardware vendor behind any MAC address and decode the OUI bits.
DNS Lookup
Query live A, AAAA, MX, TXT, NS, CNAME and SOA records for any domain.
What Is My IP
See your public IP address, reverse DNS, ISP and location instantly.
IP Location Lookup
Geolocate any IPv4 or IPv6 address: country, city, ISP, ASN and timezone.
CIDR Calculator
Expand a CIDR block to its range, or aggregate an IP range into CIDR blocks.
IPv6 Subnet Calculator
Network, address range, expanded form and subnet counts for any IPv6 prefix.
dBm to Watt Converter
Convert RF power between dBm, mW and watts, and dB gain to a linear ratio.
Link Budget Calculator
Input Parameters:
Calculated Link Results:
Dedicated Calculator Specifications & Worked Examples
Explore individual technical landing pages for worked engineering examples, formula explanations, and dedicated FAQ documentation for each calculator.
CGNAT Calculator
Calculate CGNAT public IPv4 address requirements, subscriber port block allocations, and NAT444 capacity for ISPs and WISPs.
GPON Splitter & Optical Budget Calculator
Calculate GPON optical power loss, splitter attenuation (1:2 to 1:64), fiber distance loss, and ONT rx signal budget.
IPv4 Subnet & CIDR Calculator
Calculate network address, broadcast address, subnet mask, wildcard mask, and usable host ranges for any IPv4 CIDR prefix.
IPv6 Subnet & Prefix Calculator
Calculate IPv6 expanded addresses, subnet ranges, prefix breakdowns, and total /64 subnets from any IPv6 prefix (/48, /56, /64).
Wireless Link Budget & FSPL Calculator
Calculate FSPL, RSSI, link margin, and EIRP for outdoor fixed wireless links (2.4GHz, 5GHz, 11GHz, 60GHz, 80GHz).
UPS Battery Backup Runtime Calculator
Calculate UPS battery backup runtime (hours/minutes) based on power load (Watts), battery voltage (V), capacity (Ah), and inverter efficiency.
SLA Uptime & Downtime Calculator
Convert SLA uptime percentages (99.9%, 99.99%, 99.999%) to allowable downtime per day, week, month, and year.
dBm to Watt & Power Converter
Convert RF and optical signal power between dBm, milliwatts (mW), watts (W), and decibel ratios.
Tower Revenue & ROI Calculator
Calculate WISP tower profitability, monthly OPEX, recurring revenue, net profit margin, and CAPEX payback period.
Data & Bandwidth Unit Converter
Convert between Mbps, Gbps, MB/s, GB/s, and calculate file download duration across network connection speeds.
ISP Oversubscription & Backhaul Calculator
Calculate total required internet backhaul capacity based on subscriber count, package plan speeds, and peak oversubscription ratios.
Kashtrix Platform ROI & Cost Savings Calculator
Calculate monthly and annual cost savings when upgrading legacy ISP billing software (Splynx, Sonar, PowerCode) to Kashtrix.
MAC Address OUI & Vendor Lookup
Search MAC addresses to identify hardware manufacturers (MikroTik, Ubiquiti, Huawei, Cisco, Nokia) and decode OUI prefix bits.
DNS Record & Propagation Lookup
Query live A, AAAA, MX, TXT, NS, CNAME, and SOA DNS records using Google DNS over HTTPS (DoH).
What Is My IP & Client Connection Detector
Detect your public IPv4 or IPv6 address, reverse DNS hostname, ISP network provider, and geographic gateway location instantly.
IP Geolocation & ASN Lookup
Lookup geographic location, country, city, ISP network, and ASN details for any IPv4 or IPv6 address.
CIDR Block & IP Range Calculator
Convert IP ranges to CIDR notation or expand CIDR blocks into starting and ending IP addresses.
Tell us what you need
Specify your network scale, multi-vendor hardware, or custom OSS/BSS integration needs. Our engineering architects will analyze your requirements.