- 🇩🇪IMAF ONE 9 m · Law enforcement vessel 218040490 — CLASS B
- 🇫🇷IMAGINATIQUE 15 m · Pilot vessel 227454770 — CLASS B
- 🇧🇪IMPERADOR I 50 m · Dredger 205592890 — —
- 🇫🇷IMPERIUM 22 m 228469800 — CANNES
- 🇳🇱INCEPTO Dredger 244690076 — NLRTM01068DOCKX00009
- 🇰🇷INCHEON 304 23 m · Law enforcement vessel 440002530 — —
- 🇺🇸INDEPENDENCE 119 m 367589280 — US^06WF → 0SWJ
- 🇺🇸INDEPENDENCE 12 m · Anti-pollution vessel 367788570 — CLASS B
- 🇦🇺INDI SPIRIT 10 m · Diving support vessel 503078820 — CLASS B
- 🇦🇺INDIAN J Dredger 503118550 — CLASS B
- 🇦🇺INDIGO 8 m · Port tender 503091810 — CLASS B
- 🇦🇺INDIGO 12 m · Port tender 503558500 — CLASS B
- 🇺🇸INEZ ANDREAS 364 m 366947510 100556415 US^0DA0 → 0UDJ
- 🇸🇪INFERNO 11 m · Search and rescue vessel 265046450 — CLASS B
- 🇦🇺INGELARA 10 m · Port tender 503413700 — CLASS B
- 🇸🇪INGEMAR 16 m · Dredger 265758020 — —
- 🇳🇴INGER JOHANNE 11 m · Search and rescue vessel 258022120 — —
- 🇮🇸INGIBJORG 17 m · Search and rescue vessel 251861940 — ISHFN
- 🇮🇸INGIBJORG (SAR) 15 m · Search and rescue vessel 251363110 — VHF CH16
- 🇫🇷INISHGLAS Dredger 227056890 — CLASS B
- 🇳🇱INNOVATIE 73 m · Dredger 244100907 — YANGTZEKANAAL
- 🇺🇸INNOVATOR 114 m 367456820 8981420 KINDER MORGAN
- 🇺🇸INNOVATOR 115 m 367564240 — ITC DEER PARK
- 🇩🇪INSA 12 m · Dredger 211179610 — BREMERHAVEN
- 🇳🇱INSPECTOR 9 m · Dredger 244010714 — CLASS B
- 🇳🇴INSPEKSJONSBAAT 08A — 257579800 — —
- 🇺🇸INTEGRITY 6 m · Search and rescue vessel 338527078 — —
- 🇺🇸INTEGRITY 211 m 367426950 — US^0X83 → 0YHR
- 🇺🇸INTEGRITY 207 m 367456830 8981418 MCKINNEY FLEET BATON
- 🇳🇱INTERBALLAST III 70 m · Dredger 244269000 8113463 DREDGE-HOOFDPLAAT
- 🇺🇸INTERCEPTOR Law enforcement vessel 338525659 — —
- 🇫🇮INTERPERSONA RESCUE 8 m · Search and rescue vessel 230039480 — CLASS B
- 🇺🇸INTERPORT PILOT 14 m · Pilot vessel 366967130 — CLASS B
- 🇺🇸INTERPORT PILOT III Pilot vessel 368326630 — CLASS B
- 🇬🇧INVESTIGATOR 8 m · Port tender 235065331 — —
- 🇸🇬INVESTIGATOR Pilot vessel 563078860 — SINGAPORE
- 🇬🇧INVICTA 9 m · Search and rescue vessel 232027617 — —
- 🇬🇧INVICTUS 11 m · Law enforcement vessel 232059502 — —
- 🇬🇧INVINCIBLE 26 m · Diving support vessel 235001641 — CLASS B
- 🇵🇱INZ. ST. LEGOWSKI 78 m · Dredger 261000840 7402441 GDANSK
- 🇪🇸IP 109 10 m 225997775 — CLASS B
- 🇺🇸IPSWICHPD25 9 m · Search and rescue vessel 338148647 — CLASS B
- 🇳🇱IR. F. W. CONRAD 27 m · Dredger 244770336 134318597 ROTTERDAM
- 🇮🇪IRCG CROSSHAVEN 8 m · Search and rescue vessel 250002491 — CLASS B
- 🇮🇪IRCG RELIEFDELTA 7.9 7 m · Search and rescue vessel 250004462 — CLASS B
- 🇯🇵IRIS II 17 m · Law enforcement vessel 431015714 — CLASS B
- 🇪🇸IRMANS GARCIA NODAL 40 m · Search and rescue vessel 224595000 9329265 A ORDENES
- 🇺🇸ISABEL PLUCK 112 m 368380060 1344116 US^08HM → 0JF9
- 🇳🇴ISABELL 8 m · Diving support vessel 257950880 — —
- 🇺🇸ISABELLA JULIETTE 251 m 368293190 1326320 US^03AS → 0VMN
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