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N4IOO

Available1x3District 4

Competitive callsign — 1 application filed with the FCC.

License HolderROTHMAN, ROBERT A

License ClassAmateur Extra

Min. Class RequiredGeneral

LocationBROOKLYN, NY

Grant DateJul 29, 1998

Expiration DateJul 29, 2008

Cancellation DateSep 10, 2002

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N4IOO

Available1x3District 4

Competitive callsign — 1 application filed with the FCC.

License HolderROTHMAN, ROBERT A

License ClassAmateur Extra

Min. Class RequiredGeneral

LocationBROOKLYN, NY

Grant DateJul 29, 1998

Expiration DateJul 29, 2008

Cancellation DateSep 10, 2002

Available for ApplicationsSep 11, 2004

N4IOO is a highly sought-after 1x3 format amateur radio callsign. The license is currently held by ROTHMAN, ROBERT A in BROOKLYN, NY. This callsign has attracted significant interest in the amateur radio community, with 1 vanity application filed with the FCC. The most recent was submitted by Cai, Baiyi on May 11, 2021. N4IOO has 1 recorded FCC license history event.

CW & Voice Analysis

Morse Code

-. ....- .. --- ---

CW Weight: 31 units(Moderate)

Voice Phonetics

November Four India Oscar Oscar

Readability: 7/10(Good readability)

This callsign is available now

Requires General license or higher to apply for this callsign format (1x3).

License History

License CanceledSep 10, 2002

Vanity Application Activity

Competing applications filed with the FCC for this callsign.

Cai, BaiyiFiled May 11, 2021
Not awardedFCC ↗

Search external databases

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FCC data as of Sep 3, 2026

N4IOO FCC Vanity Status: 1 Competing Application & History