We found one dictionary that defines the word loopbacks:

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1. loopbacks: Wiktionary

Opposite: outbound, forward, straight-through ▸ Words similar to loopbacks ▸ Usage examples for loopbacks ▸ Idioms related to loopbacks ▸ Wikipedia articles (New!) ▸ Words that often appear near loopbacks ▸ Rhymes of loopbacks ▸ Invented words related to loopbacks