Это яндекс индексирует.
по данным RIPE:
% This is the Ripe-Mirror Whois server.
% Note: this output has been filtered.
% Information related to '87.250.252.0 - 87.250.255.255'
inetnum:        87.250.252.0 - 87.250.255.255
netname:        YANDEX-252
descr:          Yandex search engine
country:        RU
admin-c:        YNDX1-RIPE
tech-c:         YNDX1-RIPE
status:         ASSIGNED PA
mnt-by:         YANDEX-MNT
source:         RIPE # Filtered
role:           Yandex LLC Network Operations
address:        Yandex LLC
address: 1 bld. 21 Samokatnaya St.
address: 111033
address: Moscow
address: Russian Federation
phone: +7 495 739 7000
fax-no: +7 495 739 7070
remarks:        trouble:      ------------------------------------------------------
remarks:        trouble:      Points of contact for Yandex LLC Network Operations
remarks:        trouble:      ------------------------------------------------------
remarks:        trouble:      Routing and peering issues:  
noc@yandex.net
remarks:        trouble:      SPAM issues:                 
abuse@yandex.ru
remarks:        trouble:      Network security issues:     
abuse@yandex.ru
remarks:        trouble:      Mail issues:                 
postmaster@yandex.ru
remarks:        trouble:      General information:         
info@yandex.ru
remarks:        trouble:      ------------------------------------------------------
admin-c:        VLI1-RIPE
admin-c: TVB11-RIPE
tech-c:         VLI1-RIPE
nic-hdl:        YNDX1-RIPE
mnt-by:         YANDEX-MNT
source:         RIPE # Filtered
abuse-mailbox:  
abuse@yandex.ru
% Information related to '87.250.252.0/24AS13238'
route:          87.250.252.0/24
descr:          Yandex enterprise network
origin:         AS13238
mnt-by:         YANDEX-MNT
source:         RIPE # Filtered