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AFTER HOURS / RONIT'S NETWORK LAB

Useful by day.
Curious after hours.

A network admin's workbench, a few small games, and a playful look at the connections that bring you here. Practical tools, with room to explore.

12 admin tools4 gamesLocal IEEE lookupNo account needed

Open the toolbox ↓Find a game ↓

CONNECTION OBSERVATORY

Your connection, made visible.

PUBLIC IP · ON DEMAND

Not detected yet

Detection contacts ipify only when clicked. No IP history is saved. VPNs, proxies and split routing can change what different services see.

You can explore the simulated path without detecting your IP.

SIMULATED ROUTE · NOT A REAL TRACEROUTE

01Your browserPublic IP hidden until requested—
02Local gatewayIllustrative · not discovered—
03ISP edgeIllustrative · not discovered—
04Transit networkIllustrative · not discovered—
05CDN edgeIllustrative · not discovered—
06ronit.com.npThis website · destination—

The middle nodes and hop times are invented for this illustration. Your actual router path and hop count are not available to browser JavaScript.

SYNTHETIC RTT · SIMULATION: Not simulated yet
MEASURED HTTPS REQUEST TIME: Not measured yet

The optional HTTP test sends three requests to this site. It measures browser / connection / CDN response time, not ICMP ping or packet loss.

The admin's workbench.

Calculations and MAC matching stay local. DNS queries use Google Public DNS only when submitted. Copy or download your results.

IPCALC

IPv4 subnet calculator

CIDR, dotted netmask, wildcard, usable range, binary, hex and reverse DNS.

IPV6

IPv6 calculator

Expanded / compressed notation, network bounds, exact counts and reverse DNS.

ADDRESS PLAN

VLSM planner

Largest-first allocation, host requirements and /31 /32 endpoint options.

ROUTE HYGIENE

CIDR aggregation & ranges

Exact CIDR collapse and minimal CIDRs for a start–end address range.

CHANGE CHECK

Network overlap checker

IPv4 / IPv6 containment and intersection before a change.

IEEE REGISTRY

MAC vendor & formats

54,334 assignments. Local longest-prefix lookup and address-bit interpretation.

LIVE DNS

DNS record lookup

Public resolver answers, TTLs, DNSSEC AD flag and reverse PTR queries.

CAPACITY

Transfer-time calculator

Decimal / binary units, link rate and an explicit overhead budget.

PACKET BUDGET

MTU / MSS calculator

Effective MTU, baseline TCP MSS and ICMP payload sizes.

QUICK REFERENCE

Common-port reference

Search common TCP / UDP services without scanning anything.

LOCAL TEXT

Encoding & SHA-256

UTF-8 Base64, URL component encoding and SHA-256 digests.

LOG CORRELATION

Unix / log-time converter

Seconds, milliseconds and ISO time with UTC and Kathmandu output.

Make good connections.
Then play a little.

Small challenges grounded in real networking ideas. Personal bests live in your browser; there is no public leaderboard.

01 / DAILY ROUTING

Packet Paths

Rotate the routers and deliver your packet. Daily challenge, hints, free play and a personal best.

02 / SUBNET SPRINT

Subnet Sprint

Five quick subnet questions, explanations and daily / free-practice rounds.

03 / DNS DETECTIVE

DNS Detective

Follow the resolver evidence through five realistic troubleshooting cases.

04 / THE 2 AM INCIDENT

Incident simulator

Three scenarios, meaningful decisions, simulated outcomes and a downloadable debrief.

Sources: IEEE registration authority (local snapshot 30 October 2026), Google DNS-over-HTTPS, and IANA port registry. Tools assist planning; validate consequential production changes against your actual environment.