OC-042      DU1-4

Luzon Island (Main island and coastal islands not qualifying for other groups)

OC-090      DU1

Calamian Group (Bulalacao, Busuanga, Colocolo, Coron, Culion, Dimakya, Popototan, Tara)

OC-091     DU1

Polillo Islands (Jomalig, Kalongkooan, Kalotkot, Patnanongan, Polillo)

OC-092     DU2

Babuyan Islands (Babuyan, Calayan, Camiguin, Dalupiri, Didicas, Fuga)

OC-093    DU2

Batan Islands (Balintang, Batan, Ibuhos, Itbayat, Mabudis, North, Sabtang, Siayan, Y'ami)

OC-105    DU8

Cagayan De Sulu group (Bancoran, Cagayan de Sulu [aka Cagayan de Tawi-Tawi or Mapin], Keenapusan, San Miguel Isls)

OC-119    DU8

Jolo Group (Balanguingui, Bangalao, Bubuan [near Siasi], Cabingan, Capual, Jolo, Lapac, Lugus, Pata, Siasi, Talue, Tapaan, Tapul, Tongquil)

OC-120    DU1

Cuyo Islands (Agutaya, Bisucay, Canipo, Capnoyan, Cocoro, Cuyo, Dit, Lubic, Manamoc, plus Quiniluban Isls)

OC-125    DU6

Semirara Islands (Caluya, Semirara, Sibay, Sibolon)

OC-126    DU1

Lubang Islands (Ambil, Cabra, Golo, Lubang)

OC-128    DU1

Palawan Island (Balabac, Bancalan, Boayan, Bugsuk, Cabulauan, Calabugdong, Canabungan, Dalanganem Isls [namely Calandagan, Maducang], Dumaran, Iloc, Linapacan, Malubutglubut, Nangalao, Palawan, Pandanan)

OC-129    DU5-7

Visayan Islands (Almagro, Bantayan, Batag, Batbatan, Biliran, Biri, Bohol, Borocay, Cabilao, Calicoan, Capul, Cebu, Guimaras, Guintacan, Homonhon, Leyte, Limasawa, Mahanay, Manicani, Maniquin, Maripipi, Negros, Pacijan, Panaon, Panay, Panglao, Ponson, Poro, Samar, Santo Nino, Siquijor, Suluan, Tagapula)

OC-130    DU8,9

Mindanao Island (Main island and coastal islands not qualifying for other groups)

OC-174    DU8

Tawi Tawi Group (Baliungan, Basbas, Bilatan, Bintoulan, Bongao, Kang Tipayan Dakula & Diki, Kinapusan, Manuk Manka, Sanga Sanga, Sibutu, Simunul, South Ubian, Sugbai, Tabawan, Tandubatu, Tawi Tawi, Tumbagaan, Tumindao)

OC-175    DU9

Sarangani Islands (Balut, Sarangani)

OC-188    DU8

Pangutaran Group (Bambannan, Cabucan, Cap, Dammai, Doc Can, Kulassein, Laparan, North Ubian, Panducan, Pangutaran, Rubuan, Teomabal, Tubigan, Usada)

OC-202    DU4

Calagua Islands (Guintinua, Ingalan, Maculabo, Tinaga)

OC-207    DU1

Cagayan Islands (Arena, Cagayan, Calusa, Cavili, Dondonay, plus Tubbataha Reefs)

OC-225    DU8

Turtle Islands (Baguan, Boann, Langaan, Liniman, Taganak, plus Mambahenauhan)

OC-235    DU8-9

Mindanao's Coastal Islands (Balukbaluk, Basilan, Bayangan, Bolod Isls, Bongo, Bubuan [near Basilan], Bucas Grande, Bulan, Camiguin, Cujangan, Dassalan, Dinagat, East Bucas, Hibuson, Malamaui, Miangas, Pilas, Saluping, Samal, Sangboy Isls, Siargao, Talikud, Tamuk, Tapiantana, Tengolan)

OC-244    DU1-4

Luzon's Coastal Islands (Balesin, Banton, Burias, Cabalete, Carabao, Catanduanes, Dos Hermanas, Lahuy, Maestre de Campo, Marinduque, Masbate, Mindoro, Rapurapu, Romblon, Sibuyan, Simara, Tablas, Ticao, Verde)

All of the above information were taken from IOTA official website.