How to find xterm ipaddress?

There is a linux server in my team where everyone is using xterm to connect to the server and work.
Problem is I'm unable to find the ipaddress of the xterm user. It just shows the display as "localhost".

example:
st_capuk@MGTS5026-13sh1:~> ps -eaf | grep xterm
1010      9328  9327  0 May07 ?        00:00:00 /usr/X11R6/bin/xterm -ls -display localhost:10.0
1038     23792 23791  0 May14 ?        00:00:00 /usr/bin/X11/xterm -ls -display localhost:13.0
ss_hlr1  30095 30094  0 May15 ?        00:00:00 /usr/X11R6/bin/xterm -ls -display localhost:14.0
ss_rn    12354 12353  0 May16 ?        00:00:00 /usr/X11R6/bin/xterm -ls -display localhost:16.0
1039     12649 12648  0 May16 ?        00:00:00 /usr/bin/xterm -ls -display localhost:18.0

What happens when you issue

w

or

who

Only terminals using putty has ip address visible in "who" command. Terminals invoked by xterm command doesnt reveal ip address. Below is the output:

loaduser@MGTS5026-13sh1:~> w
 10:08:58 up 3 days, 13:04,  9 users,  load average: 0.01, 0.07, 0.11
USER     TTY        LOGIN@   IDLE   JCPU   PCPU WHAT
ss_hlr   pts/0     Mon09   15:12m  1.58s  0.01s -bash
ss_ussd  pts/1     10:05    3:11   0.54s  0.00s -bash
ss_capus pts/2     Mon16   17:31m  4.31s  0.02s -bash
loaduser pts/3     Mon16   18:00m  0.02s  0.02s -bash
loaduser pts/4     Mon15    0.00s  0.66s  0.00s w
st_capor pts/6     10:06    2:43   0.58s  0.00s -bash
ss_capus pts/10    Mon11   18:50m  0.20s  0.02s -bash
st_capuk pts/11    Mon11   15:25m  0.12s  0.12s -bash
loaduser@MGTS5026-13sh1:~> who
ss_hlr   pts/0        2012-06-18 09:49
ss_ussd  pts/1        2012-06-19 10:05
ss_capusr2 pts/2        2012-06-18 16:37
loaduser pts/3        2012-06-18 16:08
loaduser pts/4        2012-06-18 15:03
st_caporca pts/6        2012-06-19 10:06
ss_capusr1 pts/10       2012-06-18 11:39
st_capuk pts/11       2012-06-18 11:53 (192.168.134.213)
loaduser@MGTS5026-13sh1:~> finger
Login      Name                  Tty      Idle  Login Time   Where
loadhlr                          pts/8       1     Tue 10:13 
loaduser   loaduser              pts/3   18:06     Mon 16:08 
loaduser   loaduser              pts/4       -     Mon 15:03 
ss_capusr1                       pts/10  18:56     Mon 11:39 
ss_capusr2                       pts/2       2     Mon 16:37 
ss_hlr                           pts/0   15:18     Mon 09:49 
ss_ussd                          pts/1       8     Tue 10:05 
st_caporca                       pts/6       8     Tue 10:06 
st_capuk                         pts/11  15:31     Mon 11:53 192.168.134.213

Where st_capuk is the only user using putty, others use terminals invoked using xterm command.