| Subject | Portuguese | English |
| commun. | campo de loopback | loopback field |
| comp., MS | endereço de loopback | loopback address (The address of the local computer used for routing outgoing packets back to the source computer. This address is used primarily for testing) |
| commun. | endereço loopback local | local loopback address |
| commun. | mensagem de loopback | loopback message |
| commun., tech. | teste loopback | loopback test |
| tech., el. | teste loopback | loopback |