| Subject | English | Portuguese |
| IT | digital loopback | loop de teste |
| commun. | local loopback address | endereço loopback local |
| comp., MS | loopback address | endereço de loopback (The address of the local computer used for routing outgoing packets back to the source computer. This address is used primarily for testing) |
| commun. | loopback field | campo de loopback |
| commun. | loopback function | função de lacete de retorno |
| commun. | loopback message | mensagem de loopback |
| commun., tech. | loopback test | teste loopback |
| IT | loopback test | teste de autorretorno |
| IT | loopback test | teste de volta em laço |
| commun. | loopback,to | efetuar o lacete de retorno |