IP Blocking Strategies

Discussions focus on techniques for blocking abusive IP addresses and ranges from cloud providers, VPS, and VPNs to prevent spam and abuse, including challenges with dynamic IPs, shared ranges, and potential impacts on legitimate users.

➡️ Stable 0.8x Security
4,884
Comments
20
Years Active
5
Top Authors
#6041
Topic ID

Activity Over Time

2007
3
2008
13
2009
48
2010
59
2011
94
2012
107
2013
163
2014
211
2015
159
2016
303
2017
178
2018
292
2019
250
2020
323
2021
446
2022
543
2023
444
2024
473
2025
736
2026
39

Keywords

e.g ISP DNS OP DO VERY ipdeny.com APNIC CloudFlare NOTE ip ips block ip addresses addresses isps blocking ranges blocked reputation

Sample Comments

ISL Nov 5, 2013 View on HN

If their IPs became known, they might get blocked?

hayksaakian Aug 8, 2014 View on HN

if people are rotating IPs to dodge your blockers, maybe you could shadow-ban them instead? that way they don't know that the IP is bad.

simooooo Oct 23, 2016 View on HN

Most users are on dynamic IPs. So you'd probably be blocking/nagging the wrong person

United857 Jun 3, 2016 View on HN

Lots of sites (e.g. Stack Overflow) block IP ranges of cloud providers.

taf2 Aug 26, 2015 View on HN

Just be sure it's not an ip that many legit users are passing through ... Like in the days when dial up aol users would all pass through the same IP.

cmeacham98 Jun 16, 2022 View on HN

You'd be better off banning known "cloud" IP ranges than this (and I think even that protection is questionable).

jacquesm Oct 3, 2019 View on HN

Why didn't their upstream provider just blackhole their IP ranges?

ynezz Apr 26, 2016 View on HN

They don't use anything sophisticated, it's just IP range blacklist. Hint: try different VPS provider, there's plenty out there...

_aavaa_ Apr 17, 2022 View on HN

Until ISPs and the backbone connections start banning the IP addresses

sroerick Oct 23, 2025 View on HN

Why couldn't there be a crowdsourced list of ips to block similar to adblocker? You could set flags of IPs to block based on your preferences