Energy Micro MCUs can have Internet Connectivity by using W5500 (or WIZ550io).
W5500 driver was ported on Silicon Labs 32-bit MCU and it is now available.
W5500_EnergyMicro
Silicon Labs provides various 32-bit microcontroller (MCU) products for ultra-low power applications. Among them, there is an EFM32™ Tiny Gecko 32-bit Microcontroller family which has an ARM Cortex-M3 core.
TCP/UDP Loopback, DHCP and DNS protocols were tested on the EFM32TG-STK3300 (EFM32™ Tiny Gecko Starter Kit).
For more implementation details and source codes, please refer to this link Tiny Gecko.