The best replacement for subnet mask is subnet.

The best alternatives to subnet mask are rated as following:
★★★★★  subnet
★★★★  wildcard mask
★★★  netmask
★  subnet address
★  default subnet mask
★  ip address
★  variable length subnet mask
★  cidr

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Speaking about subnet mask, one probably shouldn't forget about ip address.

Other search terms related to subnet mask and their ratings are:
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