ThisCalculator

Everyday

Mac ipconfig Commands: Find IP or Renew DHCP

Updated · Standard formula, shown below

Mac ipconfig Commands: Find IP or Renew DHCP

If you need to find your Mac’s IP address or renew its DHCP lease, the ipconfig command in Terminal is the direct tool. Use ipconfig getifaddr en0 to see your local IP, and sudo ipconfig set en0 DHCP to force a new lease. This article explains the full set of ipconfig commands, how they work, and when to use them.

What is ipconfig on macOS?

On macOS, ipconfig is a command-line utility that controls and queries the network interfaces managed by the system’s configuration framework. It is distinct from the Windows ipconfig, though the name is the same. The macOS version is part of the IPConfiguration framework and is primarily used to:

  • Display the current IP address, subnet mask, and router for an interface.
  • Renew or release a DHCP lease.
  • Set a manual IP address temporarily (though this is rarely recommended).

It works alongside other tools like ifconfig (which shows all interface details) and networksetup (which manages network settings at a higher level). For most users, ipconfig is the quickest way to get IP information without opening System Settings.

How to Find Your IP Address with ipconfig

The most common command is ipconfig getifaddr, which returns the IPv4 address for a given interface. You need to know your interface name first. Typically:

  • en0 – Wi-Fi on most Macs (but on some models, especially with Ethernet, it might be en1).
  • en1 – Sometimes Wi-Fi, sometimes a USB Ethernet adapter.
  • enX – Other network interfaces (Thunderbolt bridge, USB, etc.).

To find your IP, open Terminal (in /Applications/Utilities/) and type:

ipconfig getifaddr en0

If en0 is not your active interface, try en1 or run ifconfig to list all interfaces and their assigned IPs. The output will be a simple IPv4 address like 192.168.1.10. If the interface is not connected, the command returns nothing.

To see more details, including subnet mask and router, use:

ipconfig getoption en0 subnet_mask
ipconfig getoption en0 router

These return the subnet mask and default gateway, respectively. You can also use ipconfig getpacket en0 to see the full DHCP lease details (IP, lease time, DNS servers, etc.).

How to Renew DHCP Lease with ipconfig

Renewing a DHCP lease is useful when your Mac has a stale IP, cannot connect to the network, or you need to obtain a new IP from the router. The command is:

sudo ipconfig set en0 DHCP

This tells the system to release the current lease and request a new one from the DHCP server. You must prefix with sudo because it changes network configuration. You’ll be prompted for your password. After running it, wait a few seconds and check the new IP with ipconfig getifaddr en0.

If you want to release the lease without immediately renewing (which disconnects you), use:

sudo ipconfig set en0 NONE

Then to re-obtain a lease, run the DHCP command again. In most cases, you don’t need to release manually; the set en0 DHCP command handles both steps.

Common ipconfig Commands and Their Uses

Here is a quick reference of the most useful ipconfig commands:

  • ipconfig getifaddr en0 – Show the IPv4 address for en0.
  • ipconfig getoption en0 router – Show the default gateway (router IP).
  • ipconfig getoption en0 subnet_mask – Show the subnet mask.
  • ipconfig getpacket en0 – Show the full DHCP lease packet (IP, lease time, DNS, etc.).
  • sudo ipconfig set en0 DHCP – Renew the DHCP lease.
  • sudo ipconfig set en0 NONE – Release the lease (disconnects).
  • ipconfig getsummary en0 – Show a summary of the interface configuration (including MAC address and link status).

Note that ipconfig does not show your public IP (the one seen by the internet). For that, you need to query an external service like curl ifconfig.me or check your router’s status page.

When to Use ipconfig vs. Other Tools

While ipconfig is powerful, macOS offers other ways to get network info:

  • System Settings > Wi-Fi > Details – Shows IP address, router, and DNS, but no lease renewal.
  • ifconfig – Shows all interface details, including MAC address and link status, but does not renew DHCP.
  • networksetup -setdhcp – Can also renew DHCP: sudo networksetup -setdhcp "Wi-Fi". This is often more reliable for built-in interfaces.
  • route -n get default – Shows the default gateway, but not your IP.

If you’re troubleshooting a network issue, start with ipconfig getifaddr en0 to confirm you have an IP. If you have a self-assigned IP (169.254.x.x), it means DHCP failed; then renew with sudo ipconfig set en0 DHCP. If that doesn’t work, try networksetup or restart your router.

Common Problems and Fixes

Here are typical issues and how to solve them:

  • No output from getifaddr – The interface is not connected or has no IP. Check if Wi-Fi is on, or try en1.
  • Self-assigned IP (169.254.x.x) – DHCP failed. Renew the lease, check router, or try a different network.
  • Permission denied – You forgot sudo for set commands. Always use sudo.
  • Command not found – ipconfig should be in /usr/sbin, which is in the default PATH. If not, use the full path /usr/sbin/ipconfig.
  • Renew doesn’t change IP – The DHCP server may assign the same IP. To force a different one, release first (sudo ipconfig set en0 NONE), wait 10 seconds, then renew.

Safety and Precautions

Using ipconfig is generally safe, but a few points:

  • Releasing your lease (set en0 NONE) will disconnect you from the network. Make sure you have a way to reconnect (e.g., you know the Wi-Fi password).
  • Do not use ipconfig set en0 INFORM 192.168.1.50 unless you know exactly what you’re doing; it sets a static IP that may conflict with DHCP.
  • Always use sudo only for commands that require it. Running sudo with a typo could disrupt network settings.
  • These commands are for local network troubleshooting. They do not affect your public IP or security settings.

Alternatives to ipconfig

If you prefer a graphical interface, System Settings > Network shows your IP and router. For more advanced control, the networksetup command can do everything ipconfig does and more, including DNS settings. For example:

sudo networksetup -setdhcp "Wi-Fi"

This renews the DHCP lease for the Wi-Fi service. To find your public IP, use curl ifconfig.me or curl icanhazip.com. For a quick overview of all interfaces, ifconfig is still useful.

Frequently Asked Questions

Why does ipconfig getifaddr return nothing?

That means the interface has no IPv4 address. It could be disconnected, or the interface name is wrong. Check with ifconfig to see which interface has an IP, or try en1 if you’re using Wi-Fi on an older Mac.

What is the difference between ipconfig and ifconfig?

ifconfig is a lower-level tool that shows all network interfaces and their status, including MAC addresses and link flags. ipconfig is higher-level and focuses on IP configuration, including DHCP. For renewing DHCP, you use ipconfig; for interface details, ifconfig.

Can I renew DHCP without sudo?

No, changing network configuration requires administrative privileges. You must use sudo and enter your password. Viewing information (getifaddr) does not require sudo.

How do I find my router’s IP address?

Use ipconfig getoption en0 router. This returns the default gateway, which is usually your router’s IP. You can then enter that IP in a browser to access the router’s admin page.

Does ipconfig show my public IP?

No, ipconfig only shows local network addresses. To find your public IP, use curl ifconfig.me or visit a website like whatismyip.com.

Why would I need to renew DHCP?

Renewing DHCP is useful when your Mac has a self-assigned IP, cannot connect to the internet, or you want to get a new IP from the router. It’s a common first step in troubleshooting network issues.

Related

Method: the standard formula for this calculation, rounded as each result states. See how the calculators work or report an error.