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κʔϯ௖఺ͰͷΤΠϦΞε wಉ໊͡લͰଞͷϦιʔεϨίʔυ͕ଘࡏ͢Δ৔߹ɺ$/".&͸ొ࿥Ͱ͖ͳ͍ wκʔϯ௖఺ʹ͸͔ͳΒͣ40"ͱ/4Ϩίʔυ͕ଘࡏ͢Δˠ$/".&ෆՄ w)5514ϨίʔυͳΒ͹໰୊ͳ͘ొ࿥Մೳ w ͨͩ͠ɺ)5514ϨίʔυະରԠͷΫϥΠΞϯτ͕ΞΫηεͰ͖ͳ͍ͷͰɺͦΕΛߟྀ ͢Δ৔߹͕͋ΔͳΒ"""""Ϩίʔυ΋ซه͢Δඞཁ͕͋Δ example.jp. IN
SOA … IN NS … IN HTTPS 0 cdn.example.net.

ෛՙ෼ࢄͱϑΥʔϧόοΫ wαʔϏεϞʔυͰ͸.9ϨίʔυͷΑ͏ͳ༏ઌ౓ઃఆ͕Մೳ w ·ͣɺXXXͱXXXΛ౳֬཰ͰΞΫηε w ͲͪΒ΋ͩΊͳΒGBMMCBDLʹΞΫηε w GBMMCBDLͷ΄͏ʹʮো֐தͰ͢͝ΊΜͳ͍͞ʯͱ͍͏)5.-Λஔ͍͓ͯ͘ͱɺো֐؂ ࢹͱ࿈ܞͯ͠%/4Λॻ͖׵͑ͳͯ͘΋ɺϒϥ΢β͕উखʹ൑அͯ͠੾Γସ͑ͯ͘ΕΔ
example.jp. IN HTTPS 10 www1.example.jp. alpn=h3,h 2 example.jp. IN HTTPS 10 www2.example.jp. alpn=h3,h 2 example.jp. IN HTTPS 20 fallback.example.jp. alpn=h2

ॏΈ͚ͮෛՙ෼ࢄ w437Ϩίʔυͱҧͬͯ)5514ϨίʔυࣗମͰ͸XFJHIUΛઃఆͰ͖ͳ͍͚Ε Ͳɺͪΐͬͱ޻෉͢Ε͹ʜ w XXXɺXXXɺXXXʹ౳֬཰ͰΞΫηε w XXXͱXXX͸ಉ͡*1ΞυϨεˠͷׂ߹Ͱෛՙ෼ࢄ example.jp. IN
HTTPS 10 www1.example.jp. alpn=h3,h 2 example.jp. IN HTTPS 10 www2.example.jp. alpn=h3,h 2 example.jp. IN HTTPS 10 www3.example.jp. alpn=h3,h 2 www1.example.jp. IN A 192.0.2. 1 www2.example.jp. IN A 192.0.2. 1 www3.example.jp. IN A 192.0.2.2

ෳ਺ͷΤΠϦΞεϞʔυ ΂͔Βͣू wෳ਺ͷΤΠϦΞεϞʔυ͸ෆՄ wొ࿥ͯ͠΋Τϥʔʹ͸ͳΒͳ͍͕ɺͲͪΒʹΞΫηε͞ΕΔ͔ෆఆ w ϥϯμϜͰͲΕ͔ͻͱͭʮ͚ͩʯʹΞΫηε͢Δ 4)06-% w
αʔϏεϞʔυͰ͸ಉҰ༏ઌ౓ͳΒϥϯμϜॱ ΞΫηεࣦഊͨ͠ΒผαʔόΛࢼ͢ ͕ͩɺΤΠϦ ΞεϞʔυͰ͸ͻͱͭʹΞΫηεࣦͯ͠ഊͨ͠ΒଞΛࢼͣ͞ऴΘΓ w 4)06-%ͳͷͰαʔϏεϞʔυͱಉ͡Α͏ͳڍಈ͕׬શʹېࢭ͞Ε͍ͯΔΘ͚Ͱ͸ͳ͍͕ɺͦΕΛ ظ଴ͯ͠͸͍͚ͳ͍ example.jp. IN HTTPS 0 cdn-a.example.com . IN HTTPS 0 cnd-b.example.net.

ΤΠϦΞεϞʔυͱαʔϏεϞʔυͷࠞࡏ ΂͔Βͣू wΤΠϦΞεϞʔυͱαʔϏεϞʔυͷࠞࡏ͸ෆՄ w΋ࠞ͠ࡏ͍ͯͨ͠৔߹ɺαʔϏεϞʔυ͸ແࢹ͞ΕΔ w શମ͕ແޮʹͳΔͷͰ͸ͳ͘ɺΤΠϦΞεϞʔυͱͯ͠༗ޮͱ͍͏͜ͱ example.jp. IN
HTTPS 0 cdn-a.example.com . IN HTTPS 1 cnd-b.example.net.

௒ଟஈΤΠϦΞε ΂͔Βͣू w࢓্༷͸ଟஈΤΠϦΞε͕ೝΊΒΕ͍ͯΔ w͕ɺஈ਺ʹ͸্ݶΛઃ͚ͳ͚Ε͹ͳΒͳ͍ͱ΋نఆ͞Ε͍ͯΔ w Կஈ·ͰՄೳ͔͸࣮૷ґଘ ࣮૷ଆͰܾΊΔ΂͠ͱ࢓༷ʹ໌ه͞Ε͍ͯΔ w
ஈΛ௒͑Δଟஈ$/".&Λ໊લղܾͰ͖ͳ͍Ωϟογϡ%/4αʔό͕ଘࡏ͢Δ͜ͱ͔ Βɺଟஈ)5514Ϩίʔυ΋$/".&ͱ͋Θͤͯஈఔ౓·Ͱʹ͢Δͷ͕ແ೉͔ w্ݶʹͻ͔͔ͬͬͨ৔߹͸)5514Ϩίʔυ͕ଘࡏ͠ͳ͔ͬͨ΋ͷͱͯ͠ѻ͏ w ͭ·Γɺ"""""Ϩίʔυͷ໊લղܾʹϑΥʔϧόοΫ͢Δ w΋ͪΖΜɺ॥؀ΤΠϦΞε΋ෆՄ

ඇඪ४ϙʔτͷར༻ ΂͔Βͣू wϑΝΠΞ΢Υʔϧ΍)551ϓϩΫγͰ͸Ҏ֎ͷ)5514઀ଓ͕ېࢭ͞Ε͍ͯ Δέʔε͕΄ͱΜͲ w ͱ͘ʹɺ೚ҙϙʔτʹ)5514ΞΫηεͰ͖ΔϓϩΫγ͸੬ऑੑ w IUUQTXXXLCDFSUPSHWVMTJE w)5514Ϩίʔυͷ࢓্༷͸ϙʔτ൪߸ΛมߋՄೳ͕ͩɺ࣮ࡍʹ΍ͬͯ͠·͏ͱ
ΞΫηεͰ͖ͳ͍Ϣʔβ͕ଓग़͢ΔͷͰ࢖͏΂͖Ͱ͸ͳ͍ w ͜͏͍͏໰୊͕ى͖ͳ͍͜ͱ͕ࣄલʹΘ͔͍ͬͯΔ૊৫಺ωοτϫʔΫͰͷར༻ͷΈ ʹཹΊΔ΂͠ example.jp. IN HTTPS 1 . port=8443

"""""Ϩίʔυͷলུ ΂͔Βͣू w*1ΞυϨε͸JQWIJOUɺJQWIJOUͰ༩͑Δ͜ͱ͕Ͱ͖Δ w͕ɺ͋͘·ͰώϯτͰ͋Γɺ"""""Λొ࿥͠ͳ͍͍ͯ͘Θ͚Ͱ͸ͳ͍ w JQWIJOUɺJQWIJOUʹΑΔ৘ใΛʮར༻ͯ͠΋Α͍ .": ʯͰ͋Γɺແࢹ͢Δ࣮૷͸ ౰વ૝ఆ͠ͳ͚Ε͹ͳΒͳ͍
w ޙड़ͷBEEJUJPOBMTFDUJPOΛར༻͢Δํ๏͕ਪ঑͞Ε͍ͯͯɺJQWIJOU͸ͦΕʹରԠ͠ ࣮ͨ૷͕ීٴ͢Δ·Ͱͷͭͳ͗ͱ͍͏Ґஔ͚ͮ w"""""ϨίʔυͰಘΒΕΔ*1ΞυϨεͱJQWIJOUJQWIJOUʹΑΔ*1ΞυϨε ͕ҟͳΔ৔߹͸"""""ϨίʔυͷํΛਖ਼ͱΈͳ͢

47$#Ϩίʔυ w)5514Ϩίʔυ͸)551ͱͦͷ೿ੜϓϩτίϧ )5514ɺ8FC4PDLFU ༻ w47$#Ϩίʔυ͸ϓϩτίϧΛݶఆ͠ͳ͍ w TDIFNFOBNFQPSUͱ͍͏63-ʹ@QPSU@TDIFNFOBNFͷ47$#Ϩίʔυ͕ରԠ w ͭ·ΓɺҎԼͷͭ͸ҙຯతʹ͸ಉ͡ w
ͨͩ͠ɺIUUQTͳ63-Ͱ͸͔ͳΒͣ)5514ϨίʔυΛ࢖͏͜ͱʹͳ͍ͬͯͯɺ47$#͸ແޮ wIUUQTҎ֎ʹ࢖ΘΕΔ͜ͱɺROBNF͕ҟͳΔ͜ͱҎ֎͸)5514Ϩίʔυͱ ΄΅ಉ͡ example.com. IN HTTPS … _443._https.example.com. IN SVCB …

47$#Ϩίʔυͷར༻ྫ w%JTDPWFSZPG%FTJHOBUFE3FTPMWFST %%3 3'$ w %P)%P5Λ࢖͏ͨΊʹඞཁͳ৘ใΛऔಘ͢ΔͨΊͷखॱΛఆٛ w ҎԼͷ໊લͷ47$#ϨίʔυΛ໰͍߹Θͤͯ%P)%P5αʔόͷ৘ใΛಘΔ w
%PϑϧϦκϧόͷ*1ΞυϨε͚͕ͩΘ͔͍ͬͯΔ৔߹@EOTSFTPMWFSBSQB w %P)%P5αʔόͷ໊લ͸Θ͔͍ͬͯΔ৔߹@EOT\%P)%P5αʔό໊^ w ͜Μͳ47$#ϨίʔυΛొ࿥͢Δ w _dns.resolver.arpa. IN SVCB 1 . alpn=h2 ipv4hint=x.y.z.w dohpath=/dns-query{?dns } _dns.resolver.arpa. IN SVCB 1 . alpn=dot port=853 ipv4hint=x.y.z.w

ϙʔτࢦఆ͖ͭͷ63- w47$#ϨίʔυͷྲّྀͰ໊લΛهड़͢Δ wαʔϏεύϥϝʔλͰϙʔτ൪߸Λࢦఆ͢Ε͹ɺ63-͸ͳͷʹ࣮ࡍ͸ඪ ४ͷ൪ͰՔಈͤ͞Δɺͱ͍͏͜ͱ΋Մೳ w ϙʔτࢦఆͷͳ͍63-Ͱඇඪ४ϙʔτΛ࢖͏ͨΊQPSUΛࢦఆ͢Δͷ͸τϥϒϧͷݩ https://example.com:8443/ _8443._https.example.com. IN
HTTPS … _8443._https.example.com. IN HTTPS 1 example.com. port=443

Φʔόʔϔουେ͖͘ͳ͍ w͜Ε·Ͱ w """""ͷ໰͍߹Θ͚ͤͩ w͜Ε͔Β w )5514Ϩίʔυͷ໰͍߹Θͤ """""ͷ໰͍߹Θͤ w)5514Ϩίʔυͷ෼͚ͩ%/4ͷ໰͍߹Θ͕ͤ૿͑ΔˠϨΠςϯγ௿Լ

ϨΠςϯγ޲্ࡦ wΫϥΠΞϯτଆͰ΋໊લղܾ݁ՌΛΩϟογϡ͢Δ 4)06-% w)5514Ϩίʔυͱಉ࣌ʹͦΕͬΆ͍"""""΋౤ػ໰͍߹Θͤ 4)06-% w ʮͦΕͬΆ͍ʯ͕ਖ਼ղͳΒ໊લղܾʹ͔͔Δ࣌ؒΛ୹ॖͰ͖Δ w
ϋζϨͳΒ࣌ؒ୹ॖʹ͸ͳΒͳ͍͠ແବʹͳΔ͚Ͳ w)5514Ϩίʔυࣗମ͔ΒಘΒΕΔ*1ΞυϨεʹΑΓ"""""ͷ໰͍߹ΘͤΛ লུͯ͠΋Α͍ .": w ໰͍߹ΘͤΔଆ͕লུ͢Δͷ͸͍͍͚Ͳɺ͞ΕΔଆ͕ొ࿥Λলུ͢Δͷ͸ෆՄ example.com. IN HTTPS 1 . ipv4hint=192.0.2.1 ipv6hint=2001:db8::1

"%%*5*0/"-4&$5*0/ͷར༻ wैདྷ OPO)551433BXBSF w αʔό͸ฉ͔Εͨ͜ͱ͚ͩ౴͑Δ w ΫϥΠΞϯτ͸*1ΞυϨε͕ಘΒ ΕΔ·Ͱ໰͍߹ΘͤΛ܁Γฦ͢
wকདྷ )551433BXBSF w αʔό͸ฉ͔Ε͍ͯͳ͍৘ใΛ BEEJUJPOBMTFDUJPOʹࡌͤΔ w ΫϥΠΞϯτ͸͜ΕΛར༻ͯ͠໰ ͍߹ΘͤΛݮΒ͢͜ͱ͕Ͱ͖Δ ; QUESTION SECTIO N example.com. IN HTTP S ; ANSWER SECTIO N example.com. IN HTTPS 0 foo.example.com . ; ADDITIONAL SECTIO N foo.example.com. IN HTTPS 10 bar.example.com . foo.example.com. IN HTTPS 10 baz.example.com . bar.example.com. IN A 192.0.2. 1 bar.example.com. IN AAAA 2001:db8:: 1 baz.example.com. IN A 192.0.2. 2 baz.example.com. IN AAAA 2001:db8::2 )551433BXBSF OPO)551433BXBSF

"%%*5*0/"-4&$5*0/ͷར༻ wΩϟογϡαʔό w 47$#)5514"""""ϨίʔυΛBEEJUJPOBMTFDUJPOʹؚΊΔ΂͠ wݖҖαʔό w l಺෦໊ͷz47$#)5514"""""ϨίʔυΛBEEJUJPOBMTFDUJPOʹؚΊΔ΂͠ w )551433BXBSFͳΩϟογϡαʔό͕ੈؒͷେ൒ʹͳΔΑ͏ͳ࣌୅͕དྷͨΒɺ΋͸
΍JQWIJOU΍JQWIJOU͸࢖͏΂͖Ͱ͸ͳ͍ 4)06-%/05 wैདྷͷαʔόͰ΋)5514ϨίʔυͷऔΓѻ͍͸Մೳ͕ͩɺBEEJUJPOBMTFDUJPO Λ௥ՃͰ͖ΔαʔόղऍͰ͖ΔΫϥΠΞϯτͰ͸΍ΓͱΓ͕ݮͬͯޮ཰͕Α͘ ͳΔ

47$#PQUJPOBMSFMJBOUDMJFOU w47$#PQUJPOBMDMJFOUαʔϏεϞʔυ͸ඞਢͰͳ͍ w 47$#Ϩίʔυ͕ଘࡏ͠ͳ͍৔߹ɺ·ͨ͸ɺΤΠϦΞεϞʔυͷλʔήοτ໊ʹࢦఆ ໊ͨ͠લʹαʔϏεϞʔυͷ47$#Ϩίʔυ͕ଘࡏ͠ͳ͍৔߹ɺ"""""Ϩίʔυʹ ϑΥʔϧόοΫ͢Δ w47$#SFMJBOUDMJFOUαʔϏεϞʔυඞਢ w αʔϏεϞʔυͷ47$#Ϩίʔυ͕ଘࡏ͠ͳ͚Ε͹ΞΫηεࣦഊ wͲͪΒͱ࣮ͯ͠૷͢Δ͔͸ɺ47$#ϨίʔυΛར༻͢Δϓϩτίϧ͕બ୒͢Δ
w طଘͷϓϩτίϧ͸47$#PQUJPOBMDMJFOUͱ࣮ͯ͠૷͞ΕΔ΂͖ 4)"-- w )5514͸ʮطଘͷϓϩτίϧʯͳͷͰPQUJPOBM ͕ɺαʔϏεϞʔυ΋͋ͬͨ΄͏͕͍͍ΑͶ

)5514ϨίʔυͷηΩϡϦςΟ w%/44&$΍҉߸Խ%/4ͷར༻͸.645Ͱ͸ͳ͍ w௨৴ܦ࿏্ͷதؒऀ͸)5514Ϩίʔυͷ໊લղܾΛࣦഊͤ͞ΔԠ౴Λվ᜵͢Δ ͜ͱͰμ΢ϯάϨʔυ߈ܸ͕Մೳ w &$)ެ։伴͕ಘΒΕͣฏจ4/*ʹ w )454͕ޮ͔ͳ͍ w ҙਤͱ͸ҟͳΔαʔό΁ͷΞΫηε༠ಋ
μ΢ϯάϨʔυͰ͸ͳ͍͚Ͳ w͜ͷΑ͏ͳ߈ܸͷஹީΛݕ஌ͨ͠৔߹ɺΫϥΠΞϯτ͸઀ଓࢼߦΛ΍ΊΔ΂͖ 4)06-% w """""΁ͷϑΥʔϧόοΫ΋͠ͳ͍

ϑΝΠΞ΢Υʔϧͱ)5514Ϩίʔυ wʮະ஌ͷ%/4ϨίʔυλΠϓ͸ո͍͠ʯͱ͍͏ཧ༝ͰύέοτΛυϩοϓ͢Δ ϑΝΠΞ΢Υʔϧ΍*14*%4Ͱɺ)5514ϨίʔυΛר͖ఴ͑ʹ͢Δ΋ͷ͕͋Δ w ΍ͬͯΔ͜ͱ͸தؒऀ߈ܸͱಉ͡ ͦ͏͍͏ҙਤ͸ͳͯ͘΋֎ܗతʹ͸ w)5514ͷ͔ΘΓʹ"""""ϨίʔυͰ໊લղܾ͕Ͱ͖ͨͱͯ͠΋ɺ w தؒऀ߈ܸͱͯ͠ೝࣝ͞ΕΔͱɺμ΢ϯάϨʔυΛආ͚ΔͨΊϑΥʔϧόοΫ͠ͳ͍
w தؒऀ߈ܸͱͯ͠ೝࣝ͞Εͳͯ͘΋ɺ6%1ͳ%/4Ͱ͸ύέοτΛυϩοϓ͢ΔͱλΠ ϜΞ΢τΛ଴ͭ͜ͱʹͳΔͷͰ໊લղܾʹ͕͔͔࣌ؒΔ w47$#)5514Ϩίʔυ͸υϩοϓͤͣʹ௨աͤ͞ΔΑ͏ϑΝΠΞ΢Υʔϧͷ ઃఆΛมߋ͍ͯͩ͘͠͞

·ͱΊ w47$#ͱ)5514ͱ͍͏ϦιʔεϨίʔυ͕Ͱ͖·ͨ͠ w 3'$ w )551Λࢧ͑Δٕज़ͷͻͱͭ w 8FCαʔόͷ%/4΁ͷొ࿥ํ๏͕มΘΔ w $/".&
.9 Ћͷػೳ wͱ͘ʹϑΝΠΞ΢ΥʔϧͰυϩοϓͯ͠ͳ͍͔͸ࠓ͙֬͢ೝΛ

DNSでHTTPS ※ただしDNS over HTTPSではない

DNSでHTTPS ※ただしDNS over HTTPSではない

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