Theres little reason for this than bad intent.  So if you have traffic doing this also …. block them, and for me … I note them on the site like this for others.

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% Information related to '51.89.116.0 - 51.89.119.255'

% Abuse contact for '51.89.116.0 - 51.89.119.255' is '[email protected]'

inetnum:        51.89.116.0 - 51.89.119.255
netname:        PCI-DE1
country:        DE
org:            ORG-OG9-RIPE
geoloc:         50.388228 8.073916
admin-c:        OTC13-RIPE
tech-c:         OTC13-RIPE
status:         LEGACY
mnt-by:         OVH-MNT
created:        2019-08-31T15:42:00Z
last-modified:  2019-08-31T15:42:00Z
source:         RIPE

organisation:   ORG-OG9-RIPE
org-name:       OVH GmbH
org-type:       OTHER
address:        Dudweiler Landstrasse 5
address:        66123 Saarbrucken
address:        Deutschland
admin-c:        OTC13-RIPE
mnt-ref:        OVH-MNT
mnt-by:         OVH-MNT
created:        2005-09-02T12:40:05Z
last-modified:  2017-10-30T16:09:25Z
source:         RIPE # Filtered

role:           OVH DE Technical Contact
address:        OVH GmbH
address:        Dudweiler Landstrasse 5
address:        66123 Saarbrucken
address:        Deutschland
admin-c:        OK217-RIPE
tech-c:         GM84-RIPE
nic-hdl:        OTC13-RIPE
abuse-mailbox:  [email protected]

mnt-by:         OVH-MNT
created:        2009-09-16T16:09:57Z
last-modified:  2011-12-19T13:52:04Z
source:         RIPE # Filtered

% Information related to '51.89.0.0/16AS16276'

route:          51.89.0.0/16
origin:         AS16276
mnt-by:         OVH-MNT
created:        2019-02-13T09:06:24Z
last-modified:  2019-02-13T09:06:24Z
source:         RIPE

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LOCATION

Country

Germany (DE)

Continent

Europe (EU)

Coordinates

51.2993 (lat) / 9.491 (long)

Time

2019-10-04 04:05:01 (Europe/Berlin)

NETWORK

IP address

51.89.118.1

Hostname

51.89.118.1

Provider

OVH SAS

ASN

16276

https://51.89.118.1/