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Professional network tools,
ready when you are.

Subnet maths, DNS lookups, RADIUS attributes, MikroTik and Junos config, optical budgets and RF link planning — Netvorx Tools puts the everyday tooling of network engineering in one fast, dark, distraction-free place.

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18 categories Client-side by default No accounts or paywalls
IPv4 Subnet Calculator 192.168.10.0/26
Network address
192.168.10.0
Broadcast address
192.168.10.63
Subnet mask
255.255.255.192
Wildcard mask
0.0.0.63
Usable host range
192.168.10.1 - 192.168.10.62
Usable hosts
62
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The tools engineers open every day

Subnetting, lookups and generators that replace a scratchpad, a wiki page and three browser tabs.

Base64 Encoder / Decoder Encode and decode base64 and base64url, with a hex view and the HTTP Basic auth header form built for you. CIDR Aggregator Collapse a messy list of IPv4 networks into the smallest possible set of CIDR blocks - the summarisation a routing protocol or firewall object group should be carrying. Cisco ACL Builder Build Cisco extended access lists with correct wildcard masks, explicit logging and the implicit-deny behaviour made visible. Cisco VLAN & Trunk Generator Generate Cisco IOS VLAN, access port, trunk and SVI configuration with the safety settings that keep a switched network stable. Data Unit Converter Convert between bits, bytes and every decimal and binary multiple, so the difference between a GB and a GiB stops costing you an argument. dBm / mW Converter Convert optical and RF power between dBm, milliwatts, watts and dBW, with a reference scale of the levels you actually see on transceivers and radios. DNS Lookup Query any DNS record type - A, AAAA, MX, TXT, NS, SOA, CAA, SRV, DNSKEY and more - straight from your browser over DNS-over-HTTPS. DNS Propagation Check Query the same record at multiple public resolvers at once and compare the answers - the fastest way to see whether a DNS change has landed everywhere. Download Time Calculator Work out how long a transfer takes at a given line rate, with realistic protocol overhead applied instead of the marketing arithmetic. Epoch / Unix Time Converter Convert Unix timestamps to human-readable UTC and local time and back, handling seconds, milliseconds, microseconds and nanoseconds. Free Space Path Loss Calculator Calculate free-space path loss for any distance and frequency, the theoretical floor that every wireless link budget starts from. GPON Splitter Calculator Check a PON split design against the class budget: single or cascaded splitters, distance and connector count, with the per-subscriber bandwidth that split implies.

See the full tool directory

By discipline

From subnetting to syslog

Organised the way network teams actually work — by the technology you have in front of you.

IP & Subnetting

Address math, prefix planning and subnet design for IPv4 and IPv6.

8 tools

DNS & Domain

Resolve records, verify mail policy and inspect delegation.

5 tools

Network Diagnostics

Find out what your connection actually looks like from the outside.

3 tools

Bandwidth & Data

Throughput, capacity and transfer-time arithmetic.

5 tools

Protocol Reference

Searchable tables for the numbers you never memorise.

6 tools

Syslog & Logs

Decode log lines and generate logging configuration.

3 tools

RADIUS & AAA

FreeRADIUS attributes, rate limits and AAA plumbing.

6 tools

MikroTik / RouterOS

RouterOS command generators for real deployments.

4 tools

Juniper / Junos

Junos set-format configuration builders.

3 tools

Cisco

IOS, IOS-XE and NX-OS configuration builders.

3 tools

Fiber & Optical

Optical budgets, GPON splits and dBm arithmetic.

4 tools

WiFi & Wireless

RF link budgets, channel plans and path loss.

4 tools

Cabling & Power

PoE budgets, cable limits and rack power.

4 tools

ISP Toolkit

Subscriber capacity, CGNAT and pool planning.

3 tools

Web & Protocol Testing

Inspect HTTP behaviour, headers and redirects.

3 tools

Security & Crypto

Hashes, tokens, credentials and secrets - generated locally.

4 tools

Converters & Formatters

Reshape data between the formats tooling expects.

4 tools

Encoders & Utilities

Everyday engineering utilities without a signup.

4 tools
Featured

Deep tools, not toys

Purpose-built for operators: vendor syntax that pastes cleanly, and maths that survives an audit.

CGNAT Port Block Planner Plan carrier-grade NAT: how many subscribers fit behind a public pool, how large each port block should be, and the logging volume it will generate. CIDR Aggregator Collapse a messy list of IPv4 networks into the smallest possible set of CIDR blocks - the summarisation a routing protocol or firewall object group should be carrying. Cisco VLAN & Trunk Generator Generate Cisco IOS VLAN, access port, trunk and SVI configuration with the safety settings that keep a switched network stable. dBm / mW Converter Convert optical and RF power between dBm, milliwatts, watts and dBW, with a reference scale of the levels you actually see on transceivers and radios. DNS Lookup Query any DNS record type - A, AAAA, MX, TXT, NS, SOA, CAA, SRV, DNSKEY and more - straight from your browser over DNS-over-HTTPS. Hash Generator Generate SHA-1, SHA-256, SHA-384 and SHA-512 digests of any text using the browser Web Crypto API - nothing is uploaded. IPv4 Subnet Calculator Enter any IPv4 address with a prefix or mask to get the network, broadcast, usable host range, wildcard mask and host count - including correct /31 and /32 handling. IPv6 Subnet Calculator Expand any IPv6 prefix to its network range, address count and scope, and enumerate the child subnets a delegation contains.
Why Netvorx Tools

Built for the way networks are actually run

Instant answers

Every calculator runs the moment you type. No submit button, no page reload, no waiting on a server round trip.

Private by default

Addresses, configs and secrets are computed in your browser. Nothing is uploaded, logged or stored.

Built by network engineers

Edge cases that break other calculators - /31 links, RFC 6598 space, RouterOS quirks - are handled on purpose.

Explained, not just answered

Each tool documents the maths behind the result so you can defend the number in a design review.

Netvorx Pro

The toolbox is the beginning

Netvorx Tools is the free, public layer of Netvorx Pro. The same engineering feeds our work on subscriber AAA, RouterOS automation and ISP operations tooling — built for operators who run real networks, not demo labs.

About Netvorx Pro What we are building and who it is for. Request a tool Missing something? Tell us what you need next.