Guides worth opening
Twenty pieces per page. The top half is what people actually open. Under that, the newest writing. Free tools live at /tools if you need a lookup, not a long read.
Most read
What is the difference between a MAC address and an IP address?
A public IP address is what websites, IP lookup, and IP geolocation see. A MAC address stays on your local WiFi. Hide my IP needs a VPN, not a new MAC.
2 clicksYour old posts never really leave
Archives, screenshots, and the delete button that only talks to one copy.
2 clicksWhat a port is, and why you close the extra ones
Numbered doors on an IP address. Firewalls, forwarding, and the old habit of fewer listeners.
2 clicksWho can see your IP address?
ISP, the site you visit, the café, and any VPN you chose. Not the whole internet by default.
2 clicksProxy vs VPN vs Tor: pick the tool that actually hides the IP
One app, one machine, or an overlay network: what each changes on an IP lookup.
2 clicksVPN IP leaks and the kill switch
IPv6, DNS, and WebRTC can still show your real IP. Test the tunnel, then block the fallback.
2 clicksIP lookup explained: what an IP tracker can and cannot show
ISP, hostname, and IP location from an IPv4 or IPv6. Not a name, not a webcam.
2 clicksHow to change your IP address the honest way
VPN, hotspot, or a new DHCP lease. Then verify the public IP actually moved.
2 clicksLock down the home router
Admin passwords, WPA3, guest WiFi, and a yearly pass so cameras are not on the same LAN as your files.
2 clicksSocial engineering beyond the fake email
Calls, texts, QR codes, and the person at the door: fraud that uses helpfulness as a tool.
2 clicksNewly added
Linux: the student hobby that still runs the internet
Linus Torvalds, a 1991 newsgroup post, open source, Android, the cloud — and why the world's most important OS belongs to everyone and no one.
0 clicksGrace Hopper: compilers, COBOL, and the moth in the relay
The Navy admiral who taught machines to accept English-like code, helped birth COBOL, and turned a real bug into debugging folklore.
0 clicksThe transistor at Bell Labs: three physicists and a mutiny
Bardeen, Brattain, and Shockley invent the switch that replaced tubes — then Shockley's company drives the Traitorous Eight to found Fairchild and, eventually, Intel.
0 clicksThe Morris worm: the night the early internet learned fear
November 1988: a Cornell student's experiment crashed a chunk of the net, created CERT, and became the first big CFAA case.
0 clicksTim Berners-Lee and the first website: why the web was free
A CERN physicist, a NeXT computer, HTML and HTTP, and the public-domain decision that let anyone link without a license.
0 clicksThe Mother of All Demos: the day the future of computing appeared
Douglas Engelbart's 1968 mouse-and-windows demo, Xerox PARC, and how a research show became the desktop you still use.
0 clicksMargaret Hamilton: the software that landed on the Moon
Apollo's tiny guidance computer, the 1202 alarms, priority scheduling, and the engineer who made software engineering a serious word.
0 clicksThe internet's first message was "lo" — then the system crashed
October 29, 1969: UCLA to Stanford, Charley Kline's notebook, packet switching, and how a failed LOGIN became the ancestor of everything online.
0 clicksThe ENIAC women: the first programmers history forgot
Six mathematicians wired the first general-purpose electronic computer, were left out of the celebration dinner, and waited fifty years for their names.
0 clicksAlan Turing and Enigma: the machine that shortened a war
Bletchley Park, the bombe, Ultra intelligence, and the postwar prosecution of the man who helped save the country that later put him on a banknote.
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