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The Company ended the quarter with 1,723,000 total billable subscribers, which compares to 1,476,000 for the year-ago period and is up from 1,690,000 for the quarter ended September 30, 2021. Service revenue, which represents primarily recurring revenue from Iridium's growing subscriber base, was 81% of total revenue for the fourth quarter of 2021. Total revenue increased 6% versus the comparable period of 2020, while service revenue grew 8% from the year-ago period.
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Iridium reported fourth-quarter total revenue of $155.9 million, which consisted of $126.7 million of service revenue and $29.1 million of revenue related to equipment sales and engineering and support projects. Operational EBITDA ("OEBITDA") (1) for the fourth quarter was $93.4 million, as compared to $84.8 million for the prior-year period, representing a year-over-year increase of 10% and an OEBITDA margin (1) of 60%.
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This improvement was primarily the result of higher commercial service revenue and lower interest expense.
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Net loss was $5.9 million, or $0.04 per diluted share, for the fourth quarter of 2021, as compared to net loss of $7.9 million, or $0.06 per diluted share, for the fourth quarter of 2020. (Nasdaq:IRDM) ("Iridium") today reported financial results for the fourth quarter and full-year 2021 and issued its full-year 2022 guidance. 17, 2022 /PRNewswire/ - Iridium Communications Inc.
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