Tools

97 tools

They run in your browser. Nothing is sent to any server.

IP Addressing

Subnet Calculator

Compute masks, ranges, broadcast and hosts. Supports VLSM and CIDR notation.

IPv6 Calculator

Expand and compress IPv6 addresses; compute network, prefix, range, number of /64s and address type.

Subnet Mask Converter

Convert between decimal mask, CIDR and binary instantly.

CIDR Aggregator

Summarize subnet lists into supernets and convert between IP range and CIDR list.

CIDR Table

Reference table from /0 to /32: mask, wildcard, hosts, hex and private ranges, instantly filterable.

IP Converter

Convert an IPv4 between decimal, binary, hexadecimal, octal and integer, with a per-octet breakdown.

Wildcard Mask

Convert between mask, CIDR and wildcard (inverse mask) and generate Cisco ACL and OSPF network examples, with a binary breakdown.

DHCP Scope

Calculate the usable DHCP pool of a subnet (minus gateway, exclusions and reservations) and warn of exhaustion by expected clients.

Subnet Overlap

Tell whether two or more CIDR networks overlap, or one contains another or an IP (IPv4/IPv6), to avoid conflicts.

VLSM Planner

Allocate variable-length subnets to your host requirements: split a base network into optimal blocks with no waste or overlap.

Subnet Divider (FLSM)

Split a network into equal subnets by subnet count, new prefix or hosts per subnet, and list them all with range and broadcast.

NAT / PAT Exhaustion

Estimate the concurrent sessions an overloaded NAT (PAT) supports from public IPs and ephemeral ports, and warn of exhaustion.

IPv6 Planner

Split an IPv6 prefix (/48, /56…) into nibble-aligned subnets: how many /64s, site/building/VLAN hierarchy and examples.

ASN Converter

Convert autonomous-system numbers between asplain and asdot (16/32-bit) and tell whether they are public, private or reserved.

Layer 2

MAC Toolkit

Normalize MAC formats, derive EUI-64 and IPv6 link-local, identify the bits and generate a random MAC.

VLAN Decoder

Decode and build 802.1Q tags: TPID, PCP (802.1p), DEI and VLAN ID, with a binary breakdown.

MAC Vendor (OUI)

Identify a device's manufacturer from the OUI of its MAC address.

Multicast IP ↔ MAC

Convert a multicast IP (IPv4/IPv6) to its destination MAC (01:00:5e / 33:33), show the colliding IPs and the group type.

STP Cost / Root Bridge

Compute STP/RSTP path cost (short and long) by summing links by speed, and find the root bridge by bridge ID.

Link Aggregation (LAG)

Compute a LAG/EtherChannel aggregate bandwidth, the per-flow ceiling, and warn about uneven load-balancing when members are not a power of two.

Q-in-Q (802.1ad)

Encode and decode 802.1ad double tagging: S-TAG and C-TAG with TPID, PCP, DEI and VLAN ID, plus total overhead.

Cabling

Cabling Channel (TIA-568)

Check whether a run meets the 100 m channel limit (90 m horizontal + patch cords) by category and speed.

Conduit / Tray Fill

Compute the fill percentage of a conduit or cable tray from the cables and their outer diameter, with the NEC fill limit.

Patch Panel Planner

Compute patch panels and rack space (U) for a number of network drops, with growth reserve and cable managers.

Color Code (T568 / Fiber)

Show the T568A and T568B pinout (straight and crossover) and the TIA-598-C fiber color code by position.

Performance

MTU / MSS Calculator

Compute the effective MSS by subtracting Ethernet, VLAN, PPPoE, GRE, IPsec and VXLAN overhead.

TCP Throughput / BDP

Calculate maximum TCP throughput, the bandwidth-delay product (BDP) and the optimal window size.

DSCP / QoS Converter

Translate between QoS markings: DSCP (EF/AFxy/CSx), ToS/IP Precedence, hex/binary and 802.1p CoS, with their meaning.

Ethernet Frame & PPS

Compute Ethernet frame efficiency and packets-per-second at line rate (1G–100G), including preamble, IFG, VLAN and FCS overhead.

Token Bucket (Shaping)

Compute token-bucket parameters for shaping or policing: CIR, Bc, interval Tc and maximum burst, and whether a burst passes.

Jitter Buffer

Size the VoIP/video jitter buffer and compute total mouth-to-ear latency, rated against ITU-T G.114.

Video Bitrate

Estimate the bitrate and file size of a video from resolution, frame rate, codec and quality (bits per pixel).

Firewall Sizing (PPS)

Size a firewall or router: convert throughput into packets per second (with IMIX), concurrent sessions and memory.

Latency Budget

Sum a path latency: serialization per link, propagation per distance and processing per hop, for a given packet size.

Wireless

WiFi Channel Planner

Detect overlap and co-channel interference on 2.4 / 5 / 6 GHz.

Wireless Link

Point-to-point link budget: FSPL, EIRP, Fresnel zone, RSSI and fade margin.

Coaxial Cable Loss

Calculate the attenuation of a coax run (RG-58/213, LMR-400/600…) by type, frequency and length.

WiFi PHY Rates (MCS)

802.11n/ac/ax/be (HT/VHT/HE/EHT) physical-layer rate table by MCS, channel width, guard interval and spatial streams.

WiFi Airtime & Capacity

Estimate the airtime each WiFi client consumes and whether the cell saturates, showing the slow-client effect on throughput.

Antenna & RF

Convert gain dBi↔dBd, power W↔dBm↔dBW, VSWR↔return loss↔reflection coefficient, and compute EIRP and beamwidth.

CCTV

CCTV Storage

Calculate storage (TB) and bandwidth for an IP camera system by resolution, FPS, codec, retention and activity.

CCTV Lens & FOV

Calculate field of view, px/m and DORI zones (detection/identification) from lens, sensor and distance.

CCTV Project

Sum the bandwidth and storage of a project with several cameras of different profiles, to size the NVR and uplink.

VMS / NVR Server

Size the recording server (VMS/NVR): bandwidth, storage, write IOPS, RAM and number of servers by channel limit.

Optical fiber

Fiber Loss Budget

Optical power budget: connectors, splices and distance vs. dB margin.

dBm / mW Converter

Convert power between dBm, mW, W and dBW, and compute link margin by subtracting losses.

Fiber Latency

Convert fiber distance to one-way and round-trip delay (~4.9 µs/km), comparing fiber vs vacuum.

DWDM / CWDM Grid

Optical channel planner: convert between frequency, wavelength and channel number on the ITU-T grid (DWDM 12.5–100 GHz and CWDM 20 nm).

Fiber Reach by Type

Show the maximum IEEE-standard distance by fiber type (OM1–OM5, OS1/OS2) and speed (1/10/25/40/100G).

Optical Rx Margin

Compare received power against the receiver sensitivity and overload: margin, dynamic range and overload warning.

Power

PoE Budget

Calculate your devices' total draw and whether your switch can handle the load.

Voltage Drop

Calculate voltage drop (V and %) and the minimum AWG/mm² gauge for a given current, distance and voltage.

UPS Runtime

Estimate UPS backup minutes from load and batteries, and size the battery for a target runtime.

Three-Phase Power

Convert between kW, kVA, kVAR, current and power factor for single- and three-phase systems, and size with margin.

Load & Breaker

Size the circuit breaker for a load: convert VA/W to current (single or three phase), apply the 80% continuous-load rule and suggest the standard rating.

DC Battery Bank

Size a DC battery bank by autonomy: Ah capacity from load, voltage, depth of discharge, efficiency and temperature, plus the series/parallel array.

Conductor Ampacity

Compute a conductor maximum current by gauge and material, with temperature and grouping correction factors (NEC 310.16).

Generator Sizing

Size a genset from running load and motor starting peak, power factor and altitude/temperature derating.

Energy Cost & PUE

Compute a datacenter annual energy cost from IT power and PUE, the cooling overhead and CO₂ emissions.

Datacenter

Rack Capacity

Calculate rack units, power draw, BTU heat and weight.

RAID Capacity

Calculate usable capacity, overhead and fault tolerance for RAID 0/1/5/6/10/50/60 and JBOD.

Heat Load / BTU

Convert equipment, people and lighting load into heat (BTU/h or kW) and recommend the AC capacity.

Availability & SLA

Compute a system's availability from MTBF/MTTR and redundancy (series, parallel, N+1), with the nines and downtime per year.

IOPS with RAID Penalty

Compute the functional IOPS of an array from disks, RAID level and read/write mix, applying the write penalty.

Storage Growth

Project when your storage fills up from current usage and growth rate (linear or compound), with a threshold alert.

Airflow / CRAC

Convert heat load (kW) into airflow (CFM/m³·s) and tons of refrigeration from the air ΔT, to size the CRAC.

AV

HDBaseT / HDMI Distance

Show the maximum video distance over HDMI or HDBaseT by resolution and cable category.

70V / 100V Line

Sum speaker taps on a constant-voltage line, and compute impedance, load and amplifier headroom.

Projector Throw Distance

Calculate a projector's mounting distance or image size from the throw ratio and aspect ratio.

Speaker SPL

Calculate sound pressure level at a distance from sensitivity and power, or solve power/distance for a target dB.

HDMI / DP Bandwidth

Compute the Gbps a video signal requires (resolution, frame rate, color depth and chroma subsampling) and which HDMI or DisplayPort version supports it.

Video Wall

Compute physical dimensions, total resolution, pixel pitch and minimum viewing distance of an NxM display wall with bezels.

Audio Delay

Convert distance to audio delay (with temperature-corrected speed of sound) to align speakers and subwoofers, in ms and samples.

Speaker Impedance

Compute total impedance of speakers in series, parallel or series-parallel, the power per speaker and whether it is safe for the amplifier.

Audio-over-IP (Dante)

Compute audio-over-IP (Dante/AES67) network bandwidth from channels, sample rate and bit depth, plus the configured latency.

Voice

VoIP Bandwidth

Calculate per-call and total bandwidth by codec, packetization and layer-2 overhead.

Erlang Calculator

Estimate trunks (Erlang B, blocking) or call-center agents (Erlang C, service level) from traffic in Erlangs.

Voice Codecs

Compare voice codecs (G.711, G.729, Opus, AMR-WB…) by bitrate, MOS quality, sampling and delay, and compute IP bandwidth per call from codec and packetization.

Diagnostics

DNS Lookup

Query DNS records (A, AAAA, MX, TXT, NS, PTR…) over DNS-over-HTTPS.

WHOIS / RDAP

Look up registration data for domains, IPs and ASNs via RDAP, the modern WHOIS.

My IP / IP Info

Show your public IP and everything about an IP: ASN, organization, geolocation, time zone and reverse DNS.

Port Checker

Check whether one or more TCP ports are open on a host, as seen from the internet. Handy for verifying firewall rules.

Reverse PTR Zone

Generate in-addr.arpa / ip6.arpa names and sample PTR zone lines from an IP or CIDR (IPv4/IPv6).

CIDR to Regex & Range

Convert a CIDR subnet into a regular expression matching its IPs and into the address range, for log filtering and ACLs.

SPF / DKIM / DMARC

Look up and explain a domain email-authentication records (SPF, DMARC and DKIM) over DNS-over-HTTPS.

DNS Propagation

Query a DNS record on several public resolvers (Cloudflare, Google) and compare answers to see if it has propagated.

Calculation

Bandwidth

Calculate transfer time from size and speed, and convert data and speed units.

Data Converter

Convert between bits, bytes and decimal (KB/MB/GB) and binary (KiB/MiB/GiB) multiples, explaining the difference.

Frequency & Wavelength

Convert between frequency, wavelength and period in vacuum or a medium (velocity factor), for RF and optics.

dB Converter

Convert between decibels and linear ratio for power (10·log) and voltage (20·log), and between dB and nepers.