How do I know my IP address?

Question

How can I see my IP address on Ubuntu? I used

ifconfig eth0

but it only displays HWaddr and I don't see where the IP address is.

If there is no IP address in ifconfig, then you do not get one. Please [edit] your question and add output of ifconfig command. — Pilot6, Jul 07 '15 at 18:16
Relevant https://askubuntu.com/questions/430853/how-do-i-find-my-internal-ip-address http://askubuntu.com/q/95910/178596 — Wilf, Jul 07 '15 at 19:10

score 9 · Answer 1 · edited Jul 12 '17 at 20:06

9

The following command will output all of your current IP addresses, separated by spaces:

hostname -I

edited Jul 12 '17 at 20:06

Kaz Wolfe

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answered Jul 12 '17 at 19:35

tomd

191

Codeguy007 · Answer 2 · 2015-07-09T03:37:56.910

6

Your best to use ifconfig without the interface as it may not be eth0.

ifconfig | less

will allow you to page down to see what interface is assigned an IP.

You can also cheat by using route to see what interfaces are being used.

$ route
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
default         192.168.138.1   0.0.0.0         UG    0      0        0 eth2

and then use ifconfig on the interfaces listed, eg.

ifconfig eth2

edited Jul 09 '15 at 03:37

answered Jul 07 '15 at 18:01

Codeguy007

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2

Why sudo and why less? – A.B. Jul 07 '15 at 18:21
+1 but I second A.B., sudo shouldn't be needed – kos Jul 07 '15 at 18:50
I would use less because sometimes there maybe several networking devices including interfaces, aliases, bridges, tunnels. – Codeguy007 Jul 09 '15 at 03:40

Mike · Answer 3 · 2015-07-07T20:51:13.987

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Use command: ip addr show and look for your interface, for example wlan0 for WiFi and eth0 for network card.

edited Jul 07 '15 at 20:51

answered Jul 07 '15 at 18:08

Mike

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This seems to be installed by default where ifconfig may be missing. – Vincent Gerris Oct 05 '17 at 09:28

score 1 · Answer 4 · answered Jul 07 '15 at 16:44

1

If ifconfig doesn't show an IP the interface doesn't have one assigned. Assign one with sudo ifconfig 1.2.3.4 netmask 255.255.255.0 or use dhclient -d [iface] if you have a DHCP server in your network (if your uncertain try it, it doesn't hurt and is easier if it works).

answered Jul 07 '15 at 16:44

Kalle Richter

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You can additionally use ip addr to see all address (hardware, IPv4, and IPv6) assigned to an interface. (ifconfig is deprecated.) – saiarcot895 Jul 07 '15 at 16:48

kos · Answer 5 · 2015-07-07T18:47:41.280

1

If you're connected to the network through a wireless NIC, ifconfig eth0 is useless, because it will show the output of ifconfig for the first ethernet NIC (if any):

ifconfig wlan0

Or wlan1, wlan2, wlan3, [...] depending on how the NIC in use has been mapped (in case you have multiple wireless NICs).

To display only the IP address:

ifconfig wlan0 | sed -n '2s/[^:]*:\([^ ]*\).*/\1/p'

edited Jul 07 '15 at 18:47

answered Jul 07 '15 at 18:26

kos

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But only with LANG=C. My german system says inet Adresse ;) – A.B. Jul 07 '15 at 18:27
@A.B. Fair point ;) switched to the good old sed. That should match any possible language – kos Jul 07 '15 at 18:33
I think, ifconfig is enough, +1 – A.B. Jul 07 '15 at 18:39
@A.B. What do you mean? Without wlan0? – kos Jul 07 '15 at 18:42
It's also possible, that OP has eth1 or any other thing – A.B. Jul 07 '15 at 18:43
@A.B. That's true, updated – kos Jul 07 '15 at 18:48

score 1 · Answer 6 · edited Jul 08 '15 at 09:02

1

Personally I use nmcli dev show (15.04) or nmcli dev list (14.04 and earlier). It lists full information about your interfaces, dns, nearest access points, and of course your IPv4 address. You can use awk to trim the info as desired.

edited Jul 08 '15 at 09:02

A.B.

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answered Jul 07 '15 at 22:49

Sergiy Kolodyazhnyy

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Yeah, nmcli =) – A.B. Jul 08 '15 at 09:02

score 0 · Answer 7 · edited Jul 07 '15 at 18:20

0

After typing

ifconfig eth0

your IP should be listed under

inet addr

Something like:

inet addr:10.0.2.15 Bcast: 10.0.2.255 Mask:255.255.255.0

In this example, 10.0.2.15 would be your IP address.

edited Jul 07 '15 at 18:20

A.B.

90,397

answered Jul 07 '15 at 16:41

rye

109

There's no IP displayed if the interfaces doesn't have one assigned. – Kalle Richter Jul 07 '15 at 16:44

score 0 · Answer 8 · edited Jul 07 '15 at 19:59

0

Show all your IPv4 addresses:

LANG=C ifconfig | awk -F: '/inet addr/ {gsub(/ .*/,"",$2); print $2}'

Or for IPv6:

LANG=C ifconfig | awk '/inet6 addr/ {print $3}'

Or an other version:

ip addr show | awk '/inet/ {print $2}'

If you only see something like this:

127.0.0.1/8
::1/128

than you have no IP address. (127.0.0.1 doesn't count as this is your system aka localhost.)

Sample output

% LANG=C ifconfig | awk -F: '/inet addr/ {gsub(/ .*/,"",$2); print $2}'
192.168.2.131
127.0.0.1

% LANG=C ifconfig | awk '/inet6 addr/ {print $3}'   
fe80::92e2:baff:fe21:c902/64
::1/128

% ip addr show | awk '/inet/ {print $2}' 
127.0.0.1/8
::1/128
192.168.2.131/24
fe80::92e2:baff:fe21:c902/64

edited Jul 07 '15 at 19:59

Fabby

34,259

answered Jul 07 '15 at 18:38

A.B.

90,397

Nevermind, I didn't see the LANG=C – kos Jul 07 '15 at 18:45
@kos not?, the first part. o_O – A.B. Jul 07 '15 at 18:49
No, I jumped right on the right part of the pipe, because I was sure there would have been just ifconfig-something somewhere on the left! My bad – kos Jul 07 '15 at 18:53

How do I know my IP address?

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