IP Info

https://ipinfo.io/

https://ipinfo.io/faq/article/49-how-can-i-submit-a-correction

https://ipinfo.io/corrections

dbip

https://db-ip.com/

https://db-ip.com/contact/

support <at> db-ip.com

IPGeolocation

https://ipgeolocation.io/

support <at> ipgeolocation.io

Maxmind

https://www.maxmind.com/en/geoip-demo

https://support.maxmind.com/geoip-data-correction-request/

Neustar

https://www.home.neustar/resources/tools/ip-geolocation-lookup-tool

https://www.home.neustar/resources/tools/submit-to-global-ip-database

ipintel <at> support.neustar

BigDataCloud

https://www.bigdatacloud.com/ip-geolocation/

Digital Element

https://www.digitalelement.com/geolocation/

https://www.digitalelement.com/contact-us/

ip-data <at> digitalelement.com

ip2location

https://www.ip2location.com/demo

support <at> ip2location.com

Only accepts feeds when all entries have a city defined

Google

https://isp.google.com

Set geofeed URL within their ISP portal

No geofeed subscriptions in place for these organizations and require individual contact for corrections/updates

ipstack

https://ipstack.com/

https://ipstack.com/contact

Geo IP View

https://www.geoipview.com/

andrew <at> geoipview.com

email address is not currently receiving mail, as such I assume not many are using this service

IPligence

http://www.ipligence.com/geolocation

https://www.ipligence.com/contact

ipdata

https://ipdata.co/?ref=iplocation

https://ipdata.co/corrections.html

corrections <at> ipdata.co

working on adding geofeed support

IPIP

https://en.ipip.net/ip.html

sarah <at> ipip.net

IPHub

https://iphub.info/

IPinsight

https://ipinsight.io/

william <at> ipinsight.io

Info Sniper

https://infosniper.net/

https://infosniper.net/geoip-data-correction.php

GeoGuard

https://www.geocomply.com/products/geoguard/

ipintelligence <at> geoguard.com