EXHIBIT 21.1 SUBSIDIARIES OF ALASKA COMMUNICATIONS SYSTEMS HOLDINGS, INC. STATE OF NAME INCORPORATION - -------------------------------------------------------------------------------------------- -------------------- ALEC Acquisition Sub Corp................................................................... Delaware Alaska Communications Systems, Inc.......................................................... Delaware Telephone Utilities of the Northland, Inc................................................... Alaska Telephone Utilities of Alaska, Inc.......................................................... Alaska PTI Communications of Alaska, Inc........................................................... Alaska Pacific Telecom Cellular of Alaska, Inc..................................................... Alaska Pacific Telecom of Alaska PCS, Inc.......................................................... Alaska MACtel, Inc................................................................................. Alaska ATU Long Distance, Inc...................................................................... Alaska ATU Communications, Inc..................................................................... Alaska MACtel License Sub, Inc..................................................................... Delaware MACtel Fairbanks, Inc....................................................................... Alaska MACtel Fairbanks License Sub, Inc........................................................... Delaware Prudhoe Communications, Inc................................................................. Alaska Peninsula Cellular Services, Inc............................................................ Alaska PTINet, Inc................................................................................. Delaware