Hidden IP address on cisco 2600 router?

If it is a secondary address (as i thought initially) it should still show up when i do "sh int".

Below i have pasted the output-
-------------------------------------------
Ethernet0/0 is up, line protocol is up
  Hardware is AmdP2, address is 0004.4dae.89c0 (bia 0004.4dae.89c0)
  MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec, rely 255/255, load 1/255
  Encapsulation ARPA, loopback not set, keepalive set (10 sec)
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 00:00:03, output 00:00:09, output hang never
  Last clearing of "show interface" counters never
  Queueing strategy: fifo
  Output queue 0/40, 0 drops; input queue 0/75, 68908 drops
  5 minute input rate 0 bits/sec, 0 packets/sec
  5 minute output rate 0 bits/sec, 0 packets/sec
     4518343 packets input, 315919627 bytes, 66 no buffer
     Received 4517084 broadcasts, 0 runts, 0 giants, 0 throttles
     829 input errors, 0 CRC, 0 frame, 0 overrun, 829 ignored, 0 abort
     0 input packets with dribble condition detected
     731404 packets output, 43884240 bytes, 0 underruns
     419 output errors, 3 collisions, 0 interface resets
     0 babbles, 0 late collision, 12 deferred
     419 lost carrier, 0 no carrier
     0 output buffer failures, 0 output buffers swapped out

Ethernet0/1 is up, line protocol is up
  Hardware is AmdP2, address is 0004.4dae.89c1 (bia 0004.4dae.89c1)
  Internet address is 201.x.x.254/24
  MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec, rely 255/255, load 4/255
  Encapsulation ARPA, loopback not set, keepalive set (10 sec)
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 00:00:00, output 00:00:00, output hang never
  Last clearing of "show interface" counters never
  Queueing strategy: fifo
  Output queue 0/40, 235 drops; input queue 0/75, 14589 drops
  5 minute input rate 1899000 bits/sec, 234 packets/sec
  5 minute output rate 185000 bits/sec, 146 packets/sec
     981826358 packets input, 288234642 bytes, 185 no buffer
     Received 1409422 broadcasts, 0 runts, 0 giants, 0 throttles
     6513 input errors, 0 CRC, 0 frame, 0 overrun, 6512 ignored, 0 abort
     0 input packets with dribble condition detected
     729400334 packets output, 3073862623 bytes, 0 underruns
     4137 output errors, 61206094 collisions, 0 interface resets
     0 babbles, 0 late collision, 46776194 deferred
     4105 lost carrier, 0 no carrier
     0 output buffer failures, 0 output buffers swapped out
--------------------------------------------------------

I have put an 'x' in the actual ip address on eth 0/1 but rest of the output is as it is.

How do i check for a loopback interface address? And what is the purpose of giving such an ip address for a loopback interface?

"Show int" will not show secondary IPs.  "Show ip int" will.  Or you can just do a "show run" and look through the config for the IP.

-Pascal

Thanks for the responses guys.

Irmoore...your guess was right but sheahmed's answer helped me.

I ran "show running-config" and i DID see the ip address .1 as secondary on the E 0/1 interface. Thanks Sheeraz.

Its funny how i overlooked it earlier when I had typed "sh run". I did not see the address then...i guess i overlooked it in a hurry!!!

Anyways i tried "sh ip int" and that worked too. I did not know about that...so thanks pascal.

Also you both gave the right answer however I am giving the points to sheeraz as he had replied ealier and i tried his suggestion. Hope its cool with you Pascal.

Just one more question.........why would the router need two ip addresses on one interface itself???
What is E0/0 doing if both addresses are on E0/1 ? There is a cable from E0/0 is going to a port on the switch.

( I am a windows system administrator with not much exposure or experience on Cisco routers and hence the questions may be basic)