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