Crossword puzzle clue "routing notation"

Here are the possible solutions for routing notation clue

Answer
Clue
Relevancy
attn
Clue
Routing notation
Letter-routing notation
Mail-routing abbr.
Routing abbr.
Letter-routing abbr.
Routing letters
aaa
Clue
Routing org.
asn
Clue
Internet routing digits (hidden in WASN'T)

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