A total of 174 sites are hosted on 172.217.21.78.
Here are the first 5 as they would appear when searched for:
youtube.com/user/payitomalo
(null)
youtube.com/user/TP2CH
(null)
youtube.com/user/NessmaTVReplay
(null)
youtube.com/user/ZoeirasGames
(null)
youtube.com/user/amarantium
(null)
...and the list of the remaining 169:
youtube.com/user/ZwebackHD
youtube.com/user/TheBboygufran
youtube.com/user/AlgorhymesRecords
youtube.com/user/graficflower
youtube.com/user/nwaRingWarriors
youtube.com/user/KICKTVFIFA
youtube.com/user/vdbssdb
youtube.com/user/pripoka23
youtube.com/user/aquadesignamano
youtube.com/user/MCMXC5
youtube.com/user/Cairokee
youtube.com/user/tsutti20010719
youtube.com/user/DiplexHeatedHD
youtube.com/user/RCHeliJet
youtube.com/user/interlat
youtube.com/user/AmuroNamiech
youtube.com/user/PadreTeodoro
youtube.com/user/CantorLatinoOficial
youtube.com/user/airnewzealand
youtube.com/user/reynad27
youtube.com/user/pyc
youtube.com/user/PBAAtinTo
sites.google.com/site/witcherymod
youtube.com/user/1ClickPrime8
youtube.com/user/dainsurance
youtube.com/user/cetress
youtube.com/user/DansGaming
youtube.com/user/SAUElearningTube
youtube.com/user/Futurelooksdotcom
youtube.com/user/UmeimaS
youtube.com/user/cutesygirl09
youtube.com/user/ZatielScreamoHD
youtube.com/user/BarbieFullMovie
youtube.com/user/Valia011
youtube.com/user/cleanbandit
youtube.com/user/Swaminarayangurukul
youtube.com/user/pingeeecast
youtube.com/user/ForelaDigital
youtube.com/user/J0mpaMusic
youtube.com/user/iraniantvchannel1
youtube.com/user/toddspeaksmoney
youtube.com/user/abroadervieworg
youtube.com/user/MeisterLehnsherr
youtube.com/user/JusVlogs
youtube.com/user/TheEdimTV
youtube.com/user/FrancoBianco
youtube.com/user/AprilJBraswell
youtube.com/user/BeritaSatu
youtube.com/user/tokshen
youtube.com/user/ThePremiumFilm
youtube.com/user/HygroHybrid
youtube.com/user/proownez
youtube.com/user/answersvideos
youtube.com/user/tokinGLX
youtube.com/user/GeekBlogTV
youtube.com/user/RENKON831
youtube.com/user/mkrr3
youtube.com/user/OikosYogurt
youtube.com/user/McDonaldsCanada
youtube.com/user/CacauSantos
youtube.com/user/voice1242
youtube.com/user/ByDota2
youtube.com/user/RadioShack
youtube.com/user/blogdamimis
youtube.com/user/BootHammer
youtube.com/user/Expedia
youtube.com/user/vmmmm2014
youtube.com/user/safadasfunk
youtube.com/user/MsMaxsokolov
youtube.com/user/sheehing
youtube.com/user/claudemonetmonet
youtube.com/user/JaimeMSE
youtube.com/user/SinDevender
youtube.com/user/lionheartx10
youtube.com/user/SimplyJudy24hrs
youtube.com/user/fatburningman
youtube.com/user/NickTheFace2
youtube.com/user/wa3ysn
youtube.com/user/darkvikt0ry
youtube.com/user/logatelro
youtube.com/user/daftpunkalive
youtube.com/user/AnsonA4
youtube.com/user/pbsgameshow
youtube.com/user/MarckMabimods
youtube.com/user/TheArunzee
youtube.com/user/PrepperProject
youtube.com/user/lulipeci
youtube.com/user/ACompanyRussia
youtube.com/user/badwi999
youtube.com/user/Key4121
youtube.com/user/Legiondragoneros
youtube.com/user/truebankstv
youtube.com/user/RussArtel
youtube.com/user/FetishPrincessAmira
youtube.com/user/TVmusavat
youtube.com/user/Radimish
youtube.com/user/hayrettin
youtube.com/user/EnglishByJade
youtube.com/user/TheGoshaProduction
youtube.com/user/ilvostrocaroDexter
youtube.com/user/balalartv
youtube.com/user/WorldEconomicForum
youtube.com/user/TeenWoodworker
youtube.com/user/truckerjosh456
youtube.com/user/bsogoficial
youtube.com/user/WeeklyChris
youtube.com/user/StepanXolera
youtube.com/user/TheMarcusBeer
youtube.com/user/TeamBeachbody
youtube.com/user/salmaasal
youtube.com/user/ViSiioNGaMinG7
youtube.com/user/Ubuykw
youtube.com/user/ExpresarteEC
youtube.com/user/Hectorgr1
youtube.com/user/Fonso3Haze
youtube.com/user/chrysler
youtube.com/user/DenvasTV
youtube.com/user/ZCsniper
youtube.com/user/HomeWrestlingDNX
youtube.com/user/QuelTaleAle
youtube.com/user/CincoDiretos
youtube.com/user/Operation115
youtube.com/user/SlavSlavski
youtube.com/user/AlexandrosNekos
youtube.com/user/cs50tv
youtube.com/user/sarw5
youtube.com/user/MajkSpirit84
youtube.com/user/MrPeter19916
youtube.com/user/gamingwithscissors
sites.google.com/site/1914couvin
youtube.com/user/bhrushank
youtube.com/user/deataification
youtube.com/user/luferraesmake
youtube.com/user/modernmom
youtube.com/user/feichannel
youtube.com/user/ProfessorPincushion
youtube.com/user/finalbosswow
youtube.com/user/BeautifulGirlByDana
youtube.com/user/t4ct1x1
youtube.com/user/MrDendiStream
youtube.com/user/lawnpros7171
youtube.com/user/Grimro328
youtube.com/user/mmoshaya
youtube.com/user/tvrondoncuiaba
youtube.com/user/DynamicTableTennisTV
youtube.com/user/rebelledoll
youtube.com/user/nick96RUS
youtube.com/user/LinetteG1
youtube.com/user/deeljea
youtube.com/user/joserangelve
youtube.com/user/CazadoresdeBruja5
youtube.com/user/fumlewi5523
youtube.com/user/EnriqueIglesiasPlay
youtube.com/user/officialbudlight
youtube.com/user/odmag
youtube.com/user/zara
youtube.com/user/belle54304
youtube.com/user/TheJakesully123
youtube.com/user/Amberlouiseedwards
youtube.com/user/candyolivares2000
youtube.com/user/nastyarubik
youtube.com/user/MBoZeYT
youtube.com/user/atraerdinero2012
youtube.com/user/montanadeleon1