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Loran-A was dismantled starting in the 1970s; it remained active in North America until 1980 and the rest of the world until 1985. A Japanese chain remained on the air until 9 May 1997, and a Chinese chain was still listed as active as of 2000.
Loran-A used two frequency bands, at 1.85 and 1.95 MHz.
On 7 January 2010, Homeland Security published a notice of the permanent discontinuation of
LORAN-C operation. Effective 2000 UTC 8 February 2010, the United States Coast Guard terminated all operation and broadcast of LORAN-C signals in the United States.
Loran-A used two frequency bands, at 1.85 and 1.95 MHz.
Loran-C operated in the 90 to 110 kHz frequency range.
More detail here if you care:
https://en.wikipedia.org/wiki/LORAN
