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To check the static IP configuration on Ubuntu, you can use command-line tools or the graphical user interface (GUI).

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Using ip addr

ip addr show
Look for the interface you are interested in (e.g., eth0, wlan0) and check the inet line for the assigned IP address. 
3: wlo1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether a0:29:42:00:3c:78 brd ff:ff:ff:ff:ff:ff
    altname wlp0s20f3
    inet 192.168.0.20/24 brd 192.168.0.255 scope global dynamic noprefixroute wlo1
       valid_lft 84015sec preferred_lft 84015sec
  • Static IP: If the inet line does not contain the word dynamic, the IP address is statically assigned.
  • DHCP (Dynamic): If you see dynamic, the IP was assigned via DHCP.

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Using ip route

ip route list default
Sample output: 
default via 192.168.0.1 dev wlo1 proto dhcp src 192.168.0.20 metric 600
  • proto dhcp — IP was assigned via DHCP.
  • proto static — Static IP configuration.

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Inspect Netplan Configuration

grep -E "addresses:|dhcp4: (no|false)" /etc/netplan/*.yaml
If you see addresses: with a specific IP and dhcp4: no or dhcp4: false, a static IP is configured.

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Using NetworkManager CLI

nmcli con show --active
Check the IPv4 method for a specific connection: 
nmcli -f ipv4.method con show "<Your connection name>"
Sample output: 
ipv4.method:  auto
  • manual — Static IP configuration.
  • auto — DHCP configuration.

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GUI settings

  1. Open Settings > Network (or Wi-Fi).
  2. Click the gear icon next to your connection.
  3. Go to the IPv4 tab.
  4. Check if Method is set to Manual (static IP) or Automatic (DHCP).

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