What the DNS setting on your router does, and when to change it
DNS turns site names into IP addresses. Your router's DNS field picks which service does that lookup, which affects speed, privacy, and filtering.
Field notes on MAC addresses, device identification, and what's really on your network.
46 posts on PDF extraction, OCR, and building document pipelines that don't silently drop data.
IPv4 vs IPv6 on your home network, and whether you need to care
Most home networks run IPv4 and IPv6 at the same time by default, and there's rarely a reason to change that. Here's what actually differs.
What a default gateway is, and how to find yours
A default gateway is your router's address on your network, the exit point every device uses to send outbound traffic. It differs from your own device's IP.
What your router's ARP table shows, and how to read it
The ARP table maps every device's local IP address to its MAC address. Your router keeps one automatically — here's where to find it and what each row means.
What UPnP does on your router, and why it's usually best left off
UPnP lets apps open ports on your router automatically, without you approving each one. Convenient, but it trades away control over what's reachable from outside.
What causes an IP address conflict on your network, and how to fix it
An IP address conflict happens when two devices on one network claim the same local IP, usually because a manual static IP overlaps the DHCP pool.
Router model number vs marketing name vs hardware version
The name on the front is the product line. The model is on the underside label, often with a hardware revision like v2 or H/W ver — and firmware lookups need that revision.
What NAT does on your router (and why every home network needs it)
NAT lets every device on your network share one public IP address, translating local addresses to that one address and back as traffic passes through.
What the WPS button on your router does, and whether it's safe to use
WPS lets a device join WiFi by pressing a button instead of typing the password. The PIN-entry method has a known brute-force flaw, so turn it off.
What WiFi signal strength numbers (dBm, bars) actually mean
dBm is a negative number measuring signal power — closer to zero is stronger. Above -67 dBm is good, below -80 dBm is a weak connection worth fixing.
Mesh WiFi vs a single router: what actually changes
Mesh uses multiple access points sharing one network name to fix dead zones a single router can't reach; often, better placement alone solves it instead.
How to check for and install a router firmware update
Log into the router's admin page, check the current firmware version against the manufacturer's site, then update over a wired connection and never mid-update power cycle.
Should you run a VPN on your router instead of your device
A router VPN covers every connected device with no app to install, but they share one connection, so a drop or misconfig hits everything at once.
Connect an MCP client to ssid.ai over Streamable HTTP
ssid.ai now runs its MCP server over Streamable HTTP at ssid.ai/mcp/http, so any MCP client can call it without installing the npm package first.
What the DMZ setting does on a router (and why it's riskier than port forwarding)
A router's DMZ setting exposes one device to all inbound traffic on all ports, removing NAT protection entirely instead of opening a single port like forwarding does.
macadress.com pricing, self-hosted option, and free-tier limits
macadress.com's web lookup and keyless API are free with no signup. Its full API, MCP server, and self-hosted license each require an account, self-hosted from $999/year.
What a DHCP reservation is, and how to set one on your router
A DHCP reservation ties one device's MAC address to one IP address on your router, so that device gets the same local address every time it reconnects.
How to change your WiFi channel (and when it actually helps)
Changing your WiFi channel helps when a neighboring network crowds the same one, common in apartments. Check first, then switch or leave it on auto.
What your router's blinking lights actually mean
Router lights show power, internet, WiFi, and ethernet status. A steady light is normal; a fast or red blink usually points to a specific stage that failed.
What port forwarding does, and how to set it up on your router
Port forwarding opens one port on your router so an outside device can reach a specific device inside your network directly, bypassing normal NAT blocking.
Why one WiFi name shows several BSSIDs (mesh and roaming)
Every access point and every band broadcasting a network has its own BSSID, so a mesh shows one name and many BSSIDs. How to read them, and how roaming hands you between them.
How to find your current WiFi password without logging into the router
Windows, macOS, iPhone, and Android all store a WiFi password once a device has connected — here's exactly where to find it on each, no router login required.
MAC address filtering: why spoofing defeats it in minutes
A MAC filter checks a value any device can change, and every allowed address is broadcast in the clear. What it buys you, the chore it costs, and when to use it anyway.
Static IP vs dynamic IP: what's the difference at home
A dynamic IP comes from your router's DHCP pool and can change. A static IP or DHCP reservation keeps one address fixed for a device that needs it.
2.4GHz vs 5GHz WiFi: which one should your device use
5GHz is faster but covers less distance; 2.4GHz reaches farther through walls but is slower and more crowded. Most routers broadcast both and pick automatically.
Which router MAC address your ISP wants (WAN, not LAN)
An ISP that registers your hardware wants the WAN port's address, on the label and listed as WAN MAC in the admin page. Where to read it, and when MAC cloning helps.
WPA2 vs WPA3: what's the difference and which should you use
WPA3 uses a stronger handshake and blocks offline password-guessing attacks that WPA2 can't stop. Use WPA3 if your router and devices support it; WPA2 is still safe otherwise.
How to tell if someone is stealing your WiFi
Check your router's connected-devices list for anything you don't recognize. A slower network alone isn't proof — an unfamiliar device in that list is.
How to set up a guest WiFi network (and why you should)
Turn on your router's built-in guest network option, give it its own name and password, and keep visitors off the network your other devices use.
How to factory reset your router (and what it actually erases)
A factory reset wipes your router back to its as-shipped state, erasing your WiFi name, password, and connected devices, and restoring the default login.
How many devices can connect to your WiFi at once
Your router's DHCP pool and its wireless chipset set the real ceiling, not your internet plan. A standard home subnet allows up to 253 devices.
Find your MAC address with ipconfig /all or ip link show
One command prints it: ipconfig /all on Windows, ip link show on Linux. Both list one per interface, which is why a laptop has three and allow-lists miss one.
What is a subnet mask, and how to read yours
A subnet mask marks which part of an IP address names the network and which part names the device. 255.255.255.0 is the common home default.
How to make a WiFi QR code so guests can connect without typing the password
Encode your network name and password into a QR code, then let guests scan it with their phone camera to join instantly, no typing, no reading it out loud.
Router default passwords by brand: the honest guide
Most routers sold since 2019 ship with no shared admin/admin default. The real password is on a label, in the box, or set during first setup.
Hidden WiFi network: what hiding your SSID actually does
A hidden network still broadcasts — it just omits the name, so it reads as Hidden Network on your phone while any scanner still sees it. What that costs, and what to do.
How to find your router's IP address (default gateway)
Your router's IP is usually 192.168.1.1 or 192.168.0.1, but the exact one is your default gateway. Here's how to find it on Windows, macOS, iOS, and Android.
What is an OUI, and why it is not a permanent vendor ID
A MAC prefix names whoever holds the block today, not whoever built the device. 2,067 blocks were renamed from 2017 to 2026, and 4.6% now answer to a different company.
How to change your WiFi password on any router
Log into your router's admin page, open Wireless or WiFi Security, and set a new password there. It disconnects every device until each one rejoins with it.
MAC address vs IP address: what each one tells you
A MAC address identifies the physical device. An IP address identifies where it is on a network right now. Here's when each one actually matters.
How to see who is connected to your WiFi
Log into your router's admin page and open the connected devices list (usually called Attached Devices, DHCP Clients, or Device List) to see every device on your WiFi.
How to log into your router at 192.168.1.1 or 192.168.0.1
To open your router settings, type 192.168.1.1 or 192.168.0.1 into a browser and sign in. Here is how to find the right address and password.
Unknown device on my network: how to identify it fast
Found an unknown device on your WiFi? Identify it from its MAC address, IP, and hostname — and know what to do when the MAC is randomized.
MAC vendor to device type: what each manufacturer means
A vendor is not a device. Espressif means a sensor or smart plug; Hon Hai means the WiFi card inside someone else's laptop. How to get from a vendor name to a usable guess.
Private WiFi Address on iPhone and Android: turning it off
Private Wi-Fi Address is Apple's name for a randomized MAC; Android calls it Use randomized MAC. What the setting means, and the exact path to switch it off for one network.
All-zero MAC address or no vendor name: the four causes
00:00:00:00:00:00 means the interface never reported an address. A real MAC with no vendor is a virtual adapter, a registry gap, or a randomized phone. How to tell them apart.