Update cheatsheets

linux/ipcalc

@@ -0,0 +1,29 @@
+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# ipcalc
+
+> Perform simple operations and calculations on IP addresses and networks.
+> More information: <https://manned.org/ipcalc>.
+
+- Show information about an address or network with a given subnet mask:
+
+`ipcalc {{1.2.3.4}} {{255.255.255.0}}`
+
+- Show information about an address or network in CIDR notation:
+
+`ipcalc {{1.2.3.4}}/{{24}}`
+
+- Show the broadcast address of an address or network:
+
+`ipcalc -b {{1.2.3.4}}/{{30}}`
+
+- Show the network address of provided IP address and netmask:
+
+`ipcalc -n {{1.2.3.4}}/{{24}}`
+
+- Display geographic information about a given IP address:
+
+`ipcalc -g {{1.2.3.4}}`