sh ip route

Codes: 

C - connected

S - static

I - IGRP

R - RIP

M - mobile

B - BGP

D - EIGRP

EX - EIGRP external

O - OSPF

IA - OSPF inter area

N1 - OSPF NSSA external type 1

N2 - OSPF NSSA external type 2

E1 - OSPF external type 1

E2 - OSPF external type 2

E - EGP

i - IS-IS

L1 - IS-IS level-1

L2 - IS-IS level-2

ia - IS-IS inter area

* - candidate default

U - per-user static route

o - ODR

P - periodic downloaded static route