N9TPB FCC License Search
Ask: hams within 5 miles of N9TPB · Extra class operators in Madison, WI · or try N9TPB · K9* wildcards · Smith, John · 0004797601 (FRN) · 53703 · Madison, WI

Robert C Mahoney

FRN 0029291812 · first licensed Mar 10, 2020 as KO4CMK · 2 licenses on record

Complete licensing history

Address history
From FCC database snapshots (2004 → now). "Seen" dates are the first and last snapshot showing that address.

Repeaters within 50 miles

147 repeaters within 50 miles of this address, closest first · map these & export for a radio →

MilesCallOutputOffsetToneModeNetworksLocation
2.2 N4FSC 145.3100 -0.6 TSQL 77.0 FM (analog) Ashburn, VA
2.7 N3QEM 442.8750 +5 CC1 DMR AWSVirginia Sterling, VA
3.2 N4CV 443.0875 +5 CC1 DMR AWSVirginia Herndon, VA
3.2 N3OCQ 447.3500 -5 CC1 DMR BrandMeister 314789 🗓 1 net Herndon, VA
3.2 N3QEM 442.4375 +5 CC1 DMR Interstate Herndon, VA
3.2 N3QEM 927.6625 -25 CC1 DMR Interstate Herndon, VA
3.2 N3QEM 145.1637 -0.6 CC13 DMR Interstate Herndon, VA
3.2 KN4EAR 430.8000 in 445.8000 CC1 DMR BrandMeister 3100457 Reston, VA
6.3 KO4NCX 447.6750 -5 CC1 DMR BrandMeister 312899 Ashburn, VA
7.0 K4IAD 147.3300 +0.6 TSQL 203.5 FM (analog) Dulles, VA
7.3 WB6EFW 434.0000 +5 CC1 DMR BrandMeister 315103901 Ashburn, VA
7.9 WB6EFW 442.1375 +5 CC1 DMR BrandMeister 315107 Ashburn, VA
8.7 N3BBF 447.8750 -5 CC1 DMR BrandMeister 314982 Potomac, MD
8.8 K4XY 448.3750 -5 none FM (analog) AllStar 59777 Fair Oaks, VA
9.0 N3QEM 927.6750 -25 CC1 DMR Interstate Vienna, VA
9.0 N9KET 445.8000 -5 CC1 DMR BrandMeister 316759602 BrandMeister 316759603 BrandMeister 316759605 BrandMeister 316759606 BrandMeister 316759608 BrandMeister 316759609 BrandMeister 316759611 BrandMeister 316759612 BrandMeister 316759614 BrandMeister 316759615 BrandMeister 316759617 BrandMeister 316759618 BrandMeister 316759620 BrandMeister 316759623 Vienna, VA
9.3 N3QEM 442.9000 +5 CC1 DMR Interstate AWSVirginia Vienna, VA
9.3 N3QEM 145.1763 -0.6 CC13 DMR Interstate Vienna, VA
9.6 KD4RTH 443.1500 +5 CC1 DMR BrandMeister 310763 Chantilly, VA
9.6 N3OCQ 443.3500 +5 CC1 DMR BrandMeister 314601 🗓 1 net Chantilly, VA
9.7 K4HTA 146.6850 -0.6 TONE 110.9 FM (analog) AllStar 52093 EchoLink 🗓 1 net Tysons Corner, VA
11.4 N3BBF 442.9000 +5 CC1 DMR BrandMeister 314963 Potomac, MD
11.4 KV3B 442.7500 +5 TSQL 156.7 FM (analog) Rockville, MD
11.4 NC3M 445.9750 simplex TONE 100.0 FM (analog) AllStar 47835 Rockville, MD
11.9 N3JFW 442.4875 +5 CC1 DMR K4USD-Net rockville, MD
12.0 KV3B 146.9550 -0.6 none FM (analog) Rockville, MD
12.8 N3EV 145.1700 -0.6 CC1 DMR BrandMeister 311789 Leesburg, VA
12.8 N3EV 442.9000 +5 CC1 DMR BrandMeister 311790 Leesburg, VA
12.8 N3EV 447.8750 -5 CC1 DMR BrandMeister 311791 Leesburg, VA
12.8 N3EV 447.8250 -5 CC1 DMR BrandMeister 311792 Leesburg, VA
12.8 N3EV 447.7250 -5 CC1 DMR BrandMeister 311793 Leesburg, VA
12.8 WR3D 443.9000 +5 CC1 DMR OpenDMR Leesburg, VA
12.9 KA3LAO 441.8875 +5 CC1 DMR Interstate-Network Gaithersburg, MD
13.2 W9DSG 448.0625 -5 CC1 DMR BrandMeister 3223922 Falls Church, VA
13.7 KV3B 53.2700 -0.6 TSQL 156.7 FM (analog) Germantown, MD
13.7 KV3B 444.2000 +5 none D-STAR Germantown, MD
14.3 W4WVP 145.4700 -0.6 TSQL 107.2 FM (analog) Arlington, VA
15.4 WA3KOK 449.9750 -5 TSQL 107.2 FM (analog) IRLP 4000 Washington, DC
15.9 W3WDC 443.0125 +5 CC4 DMR BrandMeister 312819502 Washington, DC
16.9 KN4ANG 448.3000 simplex TSQL 110.9 FM (analog) IRLP 4048 Burke, VA
17.1 W3KIT 438.2875 simplex TONE 203.5 FM (analog) AllStar 547612 AllStar 547619 SHARI-UHF Maryland, MD
17.3 KK4QGD 425.5000 +5 CC1 DMR BrandMeister 313135 Manassas Park, VA
17.6 W4BRM
Listed as W4BRM/R
 448.2250 -5 TONE 77.0 FM (analog) AllStar 27021 Haymarket, VA
17.7 W4OVH
Listed as W4OVH/R
 224.6600 -1.6 TONE 100.0 FM (analog) AllStar 47551 Manassas, VA
17.7 K4SVT 441.9000 +5 CC1 DMR BrandMeister 311287801 Forest, VA
17.7 W3MFP 442.8875 +5 CC5 DMR BrandMeister 312428101 Wheaton, MD
18.2 K0BMM 447.3125 -5 CC1 DMR BrandMeister 322315305 Arlington, VA
18.4 K3UCB 442.9000 +5 CC1 DMR Interstate-Network Olney, MD
19.1 N8HM 438.4500 -5 CC1 DMR BrandMeister 311101701 Arlington, VA
19.2 W4HFH 444.6000 +5 TSQL 107.2 FM (analog) Alexandria, VA
19.2 W4HFH 442.0600 +5 none D-STAR Alexandria, VA
19.3 W4HFH 147.3150 +0.6 TSQL 107.2 FM (analog) Alexandria, VA
19.6 K3VOA 147.0450 +0.6 TONE 77.0 FM (analog) AllStar 23918 Silver Spring, MD
19.6 K3VOA 447.5750 -5 TONE 77.0 FM (analog) AllStar 23919 Silver Spring, MD
19.7 W3AGB 444.1625 +5 CC1 DMR DMRVA Washington, DC
19.7 W3AGB 147.3600 +0.6 CC1 DMR K4USD Washington, DC
19.7 W4HFH 442.4125 +5 CC1 DMR DMRVA Alexandria, VA
19.9 KB3LYL 442.2125 +5 CC1 DMR K4USD-Net Damascus, MD
20.0 NQ4T 223.4000 simplex TONE 100.0 FM (analog) AllStar 594081 Manassas, VA
20.0 NQ4T 439.8000 simplex TONE 100.0 FM (analog) AllStar 59408 AllStar 594080 Manassas, VA
20.3 N6PPP 445.0000 -5 CC1 DMR BrandMeister 3110809 Town, L0C4T0R, MD
20.6 K3HP 145.2500 -0.6 TONE 146.2 FM (analog) AllStar 29523 Damascus, MD
20.6 K3WS 443.3750 -5 TONE 123.0 FM (analog) AllStar 27701 Washington, DC
20.6 K3WS 447.3750 -5 TONE 123.0 FM (analog) AllStar 27701 Washington, DC
21.0 K4US 146.6550 -0.6 TSQL 141.3 FM (analog) (FM,C4FM) Alexandria, VA
21.9 N3JLT 443.1000 +5 CC1 DMR Interstate Alexandria, VA
22.5 KY3O 438.4500 -5 CC1 DMR BrandMeister 318573701 Calverton, MD
23.9 K3GMR 146.6100 -0.6 TSQL 77.0 FM (analog) Bladensburg, MD
24.0 KJ4NXG 147.4200 simplex TONE 100.0 FM (analog) AllStar 50459 Round Hill, VA
24.3 WA3RF 441.0000 +5 TONE 173.8 FM (analog) AllStar 57512 Cheverly, MD
25.3 W3GMR 146.8800 -0.6 TSQL 77.0 FM (analog) Greenbelt, MD
26.6 N3JLT 449.9250 -5 CC1 DMR Interstate-2-Network Bluemont, VA
27.2 W3SQN 442.9000 +5 CC1 DMR BrandMeister 312418 Laurel, MD
28.0 K3CUJ 147.3900 +0.6 TSQL 156.7 FM (analog) (FM,C4FM) Cooksville, MD
28.4 K8GP
Listed as K8GP/R
 443.6500 +5 TONE 77.0 FM (analog) AllStar 28185 Bluemont, VA
28.5 WA3KOK 446.5000 simplex TSQL 100.0 FM (analog) IRLP 4332 Laurel, MD
28.8 WA4TSC 147.3000 +0.6 TONE 146.2 FM (analog) 🗓 1 net Mt. Weather, VA
29.2 KR4IXC 433.3350 +1 CC1 DMR BrandMeister 3221890 Warrenton, VA
29.2 KG1JAG 446.5000 -5 CC1 DMR BrandMeister 321925001 Town, L0C4T0R, MD
29.4 W3FDK 146.7300 -0.6 TONE 141.3 FM (analog) 🗓 2 nets Frederick, MD
30.2 W4IY 147.2400 +0.6 TSQL 107.2 FM (analog) EchoLink Woodbridge, VA
30.6 KB3HGW 448.8000 -5 CC1 DMR BrandMeister 321114701 Jessup, MD
32.1 W3VLG 440.8000 +5 DG-ID 00-00 Fusion (C4FM) WIRES-X 52840 Charles Town, WV
32.1 W3VLG 145.4800 -0.6 DG-ID 00-00 Fusion (C4FM) WIRES-X 33277 Charles Town, WV
32.2 K3PZN 147.2850 +0.6 TSQL 107.2 FM (analog) 🗓 1 net Sykesville, MD
32.4 WA3DZD 146.7600 -0.6 TSQL 107.2 FM (analog) Jessup, MD
32.5 KA3LAO 442.7125 +5 CC1 DMR Interstate-2-Network Jessup, MD
34.0 W3SMR 147.1500 +0.6 TSQL 114.8 FM (analog) Brandywine, VA
34.0 N3LHD 442.4625 +5 CC1 DMR Interstate-c-Bridge-1 Brandywine, MD
34.1 KC3SNV 438.0125 -5 CC1 DMR BrandMeister 318357102 Frederick, MD
34.3 K3DO 441.9625 +5 CC1 DMR BrandMeister 312413 Frederick, MD
34.3 K3DO 447.8750 -5 CC1 DMR BrandMeister 312413 Frederick, MD
34.8 KC3OQK 439.0000 -5 CC1 DMR BrandMeister 3159601 Ellicott City, MD
34.8 KC3OQK 449.0000 -5 CC1 DMR BrandMeister 315960101 Ellicott City, MD
35.0 N3LHD 444.6500 +5 CC6 DMR Interstate-c-Bridge-1 Upper Marlboro, MD
35.4 KB3IAI 439.9000 in 438.2000 CC1 DMR BrandMeister 3172111 Gambrills, MD
35.6 KD3SU 442.9500 +5 TONE 94.8 FM (analog) AllStar 27299 Boonsboro, MD
35.6 KD3SU 146.7750 -0.6 TONE 114.8 FM (analog) AllStar 27299 Boonsboro, MD
36.1 N8RAT 223.5200 simplex TONE 100.0 FM (analog) AllStar 508861 WV/VA, VA
36.1 N8RAT 223.5600 simplex TONE 123.0 FM (analog) AllStar 508864 WV/VA, VA
36.3 KD3SU 146.5350 simplex TSQL 88.5 FM (analog) IRLP 8841 Boonsboro, MD
36.8 N3SCP 447.5500 -5 DG-ID 00-00 Fusion (C4FM) WIRES-X 18557 Gambrills, MD
37.4 KC4RCR 444.3000 +5 TONE 141.3 FM (analog) AllStar 58830 Clarke County, VA
38.2 KA2JAI 146.8050 -0.6 TSQL 107.2 FM (analog) EchoLink 🗓 1 net Millersville, MD
38.3 KQ4TNV 446.4125 -5 CC1 DMR BrandMeister 314452 Staford, VA
38.4 KR4KMS 449.5000 -5 CC7 DMR BrandMeister 322289401 Stafford, VA
39.6 W3VPR 444.4000 +5 TSQL 107.2 FM (analog) 🗓 3 nets Davidsonville, MD
39.6 W3VPR 147.1050 +0.6 TSQL 107.2 FM (analog) 🗓 3 nets Davidsonville, MD
40.1 W3VPR 147.0750 +0.6 TSQL 107.2 FM (analog) 🗓 3 nets Crownsville, MD
40.5 W4AVA 146.6250 -0.6 TSQL 107.2 FM (analog) Stafford, VA
41.0 N3EJT 147.1950 +0.6 CC1 DMR Not-Linked Owings Mills, MD
41.0 N3CDY 449.0750 -5 CC1 DMR Interstate Owings Mills, MD
41.5 W3CPO 448.5000 -5 CC1 DMR BrandMeister 312442201 Glen Burnie, MD
42.8 KB3CMA 442.3000 +5 TSQL 107.2 FM (analog) (FM,C4FM) Annapolis, MD
43.3 KD3CXK 439.0650 -1 CC1 DMR BrandMeister 3223379 Brooklyn, MD
43.3 KB3CMA 441.8375 +5 CC1 DMR Interstate-3 Annapolis, MD
44.1 K3PZN 449.8750 -5 TSQL 127.3 FM (analog) (FM,C4FM) 🗓 1 net Westminster, MD
44.2 K3PZN 145.4100 -0.6 TSQL 114.8 FM (analog) 🗓 1 net Westminster, MD
44.7 N3CDY 927.0625 -25 CC1 DMR Interstate Baltimore, MD
44.8 KI4LWQ 449.6000 in 423.0000 CC1 DMR BrandMeister 317371509 Martinsburg, WV
44.9 KR3LC 433.4500 in 446.4500 CC1 DMR BrandMeister 312414103 Pasadena, MD
45.2 W4RKC 146.8200 -0.6 TSQL 146.2 FM (analog) Winchester, VA
45.7 KC3FCQ 442.8750 +5 CC1 DMR BrandMeister 312411801 Arnold, MD
45.8 W4ATN 443.7875 +5 CC3 DMR DMR-MARC Annapolis, MD
46.6 N2XIF 442.0500 +5 CC1 DMR BrandMeister Stephens City, VA
46.7 K4MMJ 433.1000 +5 CC1 DMR BrandMeister 317511602 Fredericksburg, FMl8, VA
47.6 K3OCM 443.8500 +5 CC6 DMR K4USD-Net Towson, MD
47.6 WR3IRS 441.4000 +5 CC1 DMR Interstate Towson, MD
48.5 WG3K 444.3500 +5 CC1 DMR BrandMeister 312393 Chesapeake Beach, MD
48.5 W3FT 146.6700 -0.6 TSQL 107.2 FM (analog) Towson, MD
48.6 K3OCM 443.1875 +5 CC6 DMR K4USD-Net Charlotte Hall, MD
48.8 N8RAT
Listed as N8RAT/R
 224.7400 -1.6 TONE 131.8 FM (analog) AllStar 40485 Martinsburg, WV
49.5 N3HAZ 439.5500 in 433.5500 CC1 DMR BrandMeister 3197367 Annapolis, MD
49.6 AE4ML 442.4000 +5 CC1 DMR BrandMeister 310747 DMRVA Spotsylvania, VA
49.6 N8RAT 442.1125 +5 CC1 DMR DMRVA Fredericksburg, VA
11.1 N3QEM offline 442.9125 -5 CC? DMR Fairfax, VA
17.6 W4BRM offline 448.3250 -5 CC6 DMR BrandMeister 315148 Haymarket, VA
19.6 N3HF offline 443.4500 +5 TSQL 156.7 FM (analog) IRLP 4712 Silver Spring, MD
22.6 N3TUK offline 443.6625 +5 CC1 DMR BrandMeister 313057 Hyattsville, MD
26.8 WA3KOK offline 144.4400 simplex none FM (analog) IRLP 4173 Laurel, MD
26.8 WA3KOK offline 144.9700 simplex TSQL 107.2 FM (analog) IRLP 4542 Clarksville, MD
29.3 W3LRC offline 447.8500 -5 CC1 DMR BrandMeister 314342 Jessup, MD
35.6 KD3SU offline 147.4400 simplex TSQL 79.7 FM (analog) IRLP 8562 Boonsboro, MD
38.8 W7DQ offline 446.9250 simplex TSQL 107.2 FM (analog) IRLP 3510 Widewater, VA
39.6 KP4IP offline 442.4000 +5 CC1 DMR BrandMeister 310148 Millersville, MD
47.1 K3BAY offline 145.5400 simplex TSQL 107.2 FM (analog) IRLP 4717 Pasadena, MD
47.2 N2MCS offline 442.9000 +5 CC? DMR Baltimore, MD

Vanity applications

Filed · AwardApplicantRequested (in order)Status
Filed Mar 12, 2026
Granted Mar 31, 2026
0011944057
 KO4CMK · Robert C Mahoney · Amateur Extra
937 Rolling Holly Dr, Great Falls, VA 22066
39.0103, -77.3560 (street) · Grid FM19ha · CQ 5 · ITU 8 · map ↗
1.KO2J ✓ granted
2.N4RD held
3.NH2T available
4.NP2C available
5.NP2S available
 Granted
got KO2J
Filed Feb 10, 2026
Award date was Feb 28, 2026
0011903783
 KO4CMK · Robert C Mahoney · Amateur Extra
Attn: Robert C Mahoney · 937 Rolling Holly Dr, Great Falls, VA 22066
39.0103, -77.3560 (street) · Grid FM19ha · CQ 5 · ITU 8 · map ↗
1.KO4M held
 Dismissed