Utilities written by natevw, for natevw.

ipcalf originals

• Public IP address — it's an API too, based on HTTP "Accept" header or ?format parameter
• Private IP address — uses WebRTC to get your local (network) IP address, often useful during web development.

Random chooser

Decide

OSType/FourCC magic number converter

hex ↔︎ rgb color converter

[2d canvas required]

Grid square autolocator / QTH Utility

Latitude:
Longitude:
requesting… Auto-locate
Grid square:

Line-of-sight horizon distance calculator

Earth radius: Ignoring refraction (k=1) Effective radio (k=4/3)
Fixed height: meters kilometers feet miles
Target height: meters kilometers feet miles
Line of sight: meters kilometers feet miles

Free-space path loss calculator

Frequency: mHz Hz kHz MHz GHz THz

US bands:
2200m 630m AM 160m 80m 60m 40m 30m 20m 17m 15m 12m 10m
6m FM 2m 1.25m 70cm 33cm 23cm GPS L1 2.4GHz 5.8GHz 650nm laser

Distance: millimeters meters kilometers inches feet miles R🜨 LD AU lightyear parsec
Loss: dB

dBm ↔︎ watts converter

Voltage to power converter

Vp-p
Ω
W