user: I'm doing an analysis on our network traffic and need to identify the zip codes for several IP addresses that have come up in the logs. Could you find the zip codes for '192.168.1.1', '172.16.254.1', '10.0.0.1', and '203.0.113.0'? It would really help to understand the potential sources of the traffic.

Available functions:
name: get_zipcode_by_ip_address
description: Finds the zipcode of an IP address.
parameters: type: dict
properties: ip_address: type: string
description: The IP address to find the location of.
required: ip_address