RuneWire's official Item Database.

[Zephy]

For general items like whip go to http://itemdb.co.nr/
For customs here are the codes:

13022   Hand_Cannon
15068   Moonclan_cape
15066   Moonclan_gloves
15063   Moonclan_hat
15065   Moonclan_robe_skirt
15064   Moonclan_robe_top
15061   Runecrafting_hat
15062   Runecrafting_robe_bottom
15060   Runecrafting_robe_top
15055   Rocktail
15042   Eagle-Eye_KiteShield
15038   Chaotic_longsword
15039   Chaotic_maul
15040   Chaotic_staff
15037   Chaotic_rapier
14501   Dagon'hai_robe_bottom
14497   Dagon'hai_robe_top
14499   Dagon'hai_hat
15051   Slayer_helmet
15026   Elysian_spirit_shield
15026   Divine_spirit_shield
15022   Spectral_spirit_shield
15021   Arcane_spirit_shield
15025   Blessed_spirit_shield
15024   Spirit_shield
15016   Morrigan's_throwing_axe
15015   Morrigan's_javelin
15013   Morrigan's_leather_chaps
15012   Morrigan's_leather_body
15014   Morrigan's_coif
15011   Zuriel's_hood
15009   Zuriel's_robe_bottom
15008   Zuriel's_robe_top
15020   Statius's_warhammer
15019   Statius'_full_Helm
15017   Statius'_platebody
15018   Statius'_platelegs
15004   Vesta's_chainbody
15005   Vesta's_plate_skirt
15006   Vesta's_longsword
15007   Vesta's_spear
15027   Dragon_claws
11730   Saradomin_sword
15050   Staff_of_light