Technical building blocks
gtbit-tools
fetch it-tools: the on-site network toolbox
IPv4 subnet, IP range, address conversions, MAC vendor lookup, hex/bin bases, timestamps, Node-RED bcrypt hash, JWT decoder (ChirpStack keys).
- ipv4
- subnet
- mac
- oui
- timestamp
- bcrypt
- node-red
- jwt
Credit where credit is due: the idea comes from it-tools.tech, the great toolbox by Corentin Thomasset. We picked the ones used daily on a building automation site, rewritten for opengtb and tailored to the trade.
§ Network
§ Data
§ Security
$subnet IPv4 subnet calculator
192.168.1.10/24 · 10.0.0.5 255.255.252.0 · a bare IP = /24
- Network
- 192.168.1.0/24
- Mask
- 255.255.255.0 /24
- Wildcard
- 0.0.0.255 Cisco ACL, OSPF
- First IP
- 192.168.1.1
- Last IP
- 192.168.1.254
- Broadcast
- 192.168.1.255 BACnet/IP: Who-Is broadcast
- Usable hosts
- 254 out of 256 addresses
- Scope
- private class C
- Previous network
- 192.168.0.0/24
- Next network
- 192.168.2.0/24