- 🇳🇱KNRM-ZALM Search and rescue vessel 244790451 — CLASS B
- 🇳🇱KNRM-ZEEMANSHOOP 19 m · Search and rescue vessel 244237000 — BRESKENS
- 🇳🇴KNUBBEN 11 m · Search and rescue vessel 257582900 — —
- 🇩🇪KNURRHAHN 15 m · Pilot vessel 211787800 9817195 OCEAN SCALLION
- 🇳🇴KOBBEVIK 14 m · Dredger 257763700 — CLASS B
- 🇮🇸KOBBI LAKA 9 m · Search and rescue vessel 251858440 — CLASS B
- 🇫🇮KOILLISTUULI 11 m · Anti-pollution vessel 230094240 — HELSINKI
- 🇳🇴KOLBJORN III 15 m 258047500 — ARENDAL
- 🇩🇪KOLLMAR 26 m · Law enforcement vessel 211430400 — UNTERELBE
- 🇺🇸KOLT LEVI 70 m 369093000 — US^0YFS
- 🇳🇴KOMAGFJORD 15 m · Diving support vessel 257057050 — DYKKING OG ROV
- 🇩🇪KOMET1 7 m · Law enforcement vessel 211282861 — —
- 🇩🇪KOMET3 7 m · Law enforcement vessel 211282863 — —
- 🇩🇪KOMET4 7 m · Law enforcement vessel 211282864 — —
- 🇺🇸KON 10 m · Diving support vessel 368347580 — CLASS B
- 🇯🇵KONGOH 85 m 431020363 — CLASS B
- 🇯🇵KONGOUMARU NO7 59 m · Dredger 431018391 — CLASS B
- 🇳🇱KONING WILLEM 9 m · Search and rescue vessel 244790226 — CLASS B
- 🇳🇱KONINGIN JULIANA 21 m · Search and rescue vessel 244884000 — STELLENDAM
- 🇩🇪KONRAD-OTTO 10 m · Search and rescue vessel 211141930 — SAR IN OPERATION
- 🇵🇱KONTROLER 22 Port tender 261086080 — D
- 🇵🇱KONTROLER 25 21 m · Law enforcement vessel 261002330 — GDANSK
- 🇵🇱KONTROLER 31 25 m · Law enforcement vessel 261002303 — PATROL
- 🇵🇱KOPERNIK 1 25 m · Dredger 261003040 — —
- 🇨🇦KOPIT HOPSON 1752 83 m · Search and rescue vessel 316020000 8320470 SAR
- 🇫🇮KORKKI 7 m · Dredger 230139110 — CLASS B
- 🇩🇪KORMORAN 27 m · Dredger 211745800 — EMDENR
- 🇮🇩KORONKA SATU Pilot vessel 525501660 — CLASS B
- 🇫🇮KORPO 15 m · Search and rescue vessel 230989990 — CLASS B
- 🇳🇴KORSFJORD 13 m · Diving support vessel 257129980 — CLASS B
- 🇯🇵KOSHIKI 89 m · Search and rescue vessel 432742000 9589918 JP KOJ
- 🇸🇪KOSTERHAVET 11 m · Anti-pollution vessel 265706890 — —
- 🇦🇺KOUGARI 15 m · Port tender 503573600 — CLASS B
- 🇳🇱KP 2 20 m · Dredger 244615227 — CLASS B
- 🇮🇩KP ENGGANG 4016 Law enforcement vessel 525204016 — —
- 🇮🇩KP KOLIBRI 4015 34 m · Law enforcement vessel 525034015 — —
- 🇮🇩KP KUTILANG 5005 36 m · Law enforcement vessel 525205005 — —
- 🇸🇮KP-474 9 m · Law enforcement vessel 278959000 — CLASS B
- 🇸🇮KP-996 11 m · Anti-pollution vessel 278001003 — CLASS B
- 🇮🇩KP. BALADEWA Law enforcement vessel 525208002 — BANTEN
- 🇮🇩KP. ZAITUN 3014 22 m · Law enforcement vessel 525818297 — —
- 🇮🇩KP.ANIS KEMBANG-400 Law enforcement vessel 525204001 — TJ PRIOK
- 🇳🇱KP1 11 m · Dredger 244620012 — AMSTERDAM
- 🇩🇪KP1903 36 m · Dredger 211666960 — KOBLENZ
- 🇳🇱KP8 17 m · Dredger 244110825 — AMSTERDAM
- 🇳🇱KRAANVOGEL 41 m · Dredger 244180247 — WOUDSEND
- 🇩🇪KRABBE 38 m · Dredger 211175610 — HAMM
- 🇩🇪KRAKE 38 m · Dredger 211227610 8825418 WILHELMSHAVEN
- 🇩🇪KRAKE 22 m · Dredger 211698360 — —
- 🇨🇦KRAKEN 7 m · Dredger 316054053 — —
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