Blacklisted IPs On Local ISPs/Telcos Have Become an Intolerable Menace

If you routinely come across captcha verification requests while browsing the internet, don’t blame your service or the website you are accessing. This is due to the simple fact that your public IP used to access the website is blacklisted.

Just in case if you aren’t aware of the process through which you are connected to the internet, here’s how it is done:

  • You are connected with the local WiFi router (also known modem)
  • Your Router is connected with an ISP
  • Your router is assigned an IP (a unique number, just like telephone number)
  • Your this IP is used to identify your presence on the internet

So this IP of yours, that’s assigned by your ISP, is going to act your public identity. If it is somehow blacklisted — we will tell you later that why an IP is blacklisted — then you are going to be hounded every minute you are online.

Alarmingly, most ISPs in Pakistan are using blacklisted IPs and the problem is particularly severe for 3G/4G users. Zong, PTCL are reportedly on the top-list for usage of such bad IPs.

While some ISPs like to assign 1 IP per user, others use a technique called ‘NATing’ to identify multiple users through a single IP. The latter technique is the more common one in Pakistan.

Since NATing is commonplace, a single bad IP can be assigned to hundreds if not thousands of users and all of these users end up entering CAPCHAs when they browse the internet.

Let see why and how IPs are blacklisted.

  • When users send SPAM emails/messages
  • When users access malicious websites
  • When malware on an IP auto broadcasts scripts
  • and so on.

The issue is exacerbated by the state of security on the internet. Cyber attacks have become worryingly common and sites are using tools like CloudFlare or the lesser known Incapsula to protect themselves against such threats.

If you visit any site that takes such precautionary measures, you’ll face issues if you have been assigned a bad public IP by your service provider.

Situation Can Be Resolved Easily

What’s even more frustrating about this whole predicament is the ease with which it could be resolved.

Anytime an IP is blacklisted, the company that owns it is notified via an automated email about the incident and the reason behind it.

So if I run a ProPK hosting service and an IP is blacklisted, it would send an email to [email protected] or a more general [email protected] That in turn creates a ticket in the helpdesk software and can be resolved readily.

Unfortunately, most IP ownership in Pakistan is under private email addresses. This means blacklisted IP email notifications are sent to someone who, in all probability, doesn’t even understand what he’s receiving and just files them under spam.

All that’s needed is for service providers to work out a system to keep their network clean. They can do that through an effective network policy and by re-submitting any blacklisted IPs for reconsideration.

As mentioned above, IPs are blacklisted due to users’ activity, meaning that ISPs and Telcos aren’t responsible for the mess, but what they are responsible for is the usage on their network. For example they should restrict users from sending SPAM (Limit any SMTP connections, relay) and so on.

There are a multitude of companies that keep track of ‘IP Reputation’ and many that maintain up to date blacklists. The most well-known provider (and the industry standard) of these blacklists is So if you are listed in SpamHaus, you can be assured you’ll be restricted at the server end. There are also SmapCop, SORBS, Barracuda and SenderBase which are more commonly used by Email Servers to reject emails.

So if any site/server is using high end protection or CloudFlare/Incapsula and your IP is listed on any blacklist maintained by the well-known providers above, you are going to have issues.

Problems Faced When You are on a BlackListed IP

If you are using any Email Client (Such as Outlook, Thunderbird etc), you will face issues sending email because these email clients also forward your Public IP to the receiving server. And if the receiving server has tighter security, it will block your email.

At this point, we should add that CATPCHA codes aren’t the only harmful effects of this lazy attitude by our service providers. Email delivery can also be affected depending on server settings. If you’re shopping on international websites, your order could go straight to the Fraud section. While some sites already consider Pakistan as a high risk country and vet all information thoroughly, IP repute plays a big part in ‘Auto Fraud Checks’.

At the end of the day, it’s a major usability hurdle for users and the only way to resolve it is by bringing the attention of the service providers and governing authorities to it. For a blacklisted IP to be removed from a provider’s range or for it to be reconsidered, you need to send an email through the registered IP  ownership address. This means salvation lies purely in the hands of our ISPs and telcos.

For the more savvy of our readers, here are a few examples that we came across while we were writing the article. All of these IPs are blacklisted.

What Should ISPs and Telcos Do?

  1. Acknowledge that this is a serious issues. However, we have a sinking feeling that a large number of complaints will be the only thing that pushes them to take action.
  2. Teach helpline operators about “IP BlackLists” and what they should do if someone complains about it
  3. Encourage customers to have a working and updated Antivirus on their system to make sure nothing fishy is going on. (If you have made a complaint to PTCL for slow speed, I am sure most of you have heard the response “uninstall Antivirus”.)
  4. Develop a system to alert/check of IP reputation of their entire IP range. This is trivial to do for anyone experienced.
  5. Have someone submit a proper request for IP removal from those blacklists using the proper email ID.

What Can You as a Customer Do?

If you are browsing and see that issue, do the following

  1. Take a screenshot of the site (i.e. CAPTCHA Page)
  2. Go to to get your Public IP.
  3. 3) Go to to check your IP against multiple blacklists at the same time. Take a screenshot.
  4. Send both of the screenshots to your ISP/Telecom provider customer email asking them to resolve the issue. (May be send a link to this post as well for explanation of the issue)
  5. Pray that they will actually look into this.


If you are seeing annoying “CAPTCHA” messages on every other site, it’s because your Public IP is blacklisted. You are not alone in this issue because most of our ISP’s IPs are listed in these blacklists and that is causing serious issues.

Too many blacklisted IPs are giving us Pakistanis a bad repute on the internet. Since ISPs doesn’t really seem to care about this issue, it’s time we join hands to get this issue resolved.

Talal is a Director and the Chief Content Officer at ProPakistani. Reach out at [email protected]

  • Better to have static IP in order to avoid the problem, random or dynamic IPs blacklist problem will never solve in Pakistan due to lack using proper antivirus program and licensed software, Pakistani computers are easy target for hackers

  • Zong is charing premiums rates for their 3G,4G packages and they include zong toolbar in many websites and that is very annoying and secondly they assign blacklisted IP’s to their users which i think is fraud with their users.

    • Yeah, just noticed the toolbar on my mother’s phone yesterday while troubleshooting something for her. I had never come across it myself before since I use an adblocker on mine.

  • If you’re on PTCL BB you can restart your modem, you’ll be assigned a different IP.

  • Zong is really creating problem, I never have problem with PTCL but Zong on daily basis assign me blacklisted ips, captchas provided by website like Google are of very top level so solving them is also not an easy job.

  • Zong have every 2nd IP blacklisted. Some time it get intolerable if you are blogger or search some article. Zong officials should look into this.

  • Writer failed to mention why ISPs are using such techniques. They are doing is because world is running out of IP addresses on ipv4 and stupidly our country’s ISP never thought anything about moving to ipv6.

  • Zong has perhaps the maximum number of such IPs. Every other site I open whether its Express Tribune or E-Jang. It asks for verification. This becomes so unbearable sometimes.

  • Thats a great article, I am also the victim of this using Zong. Even few of the IPs are completely blocked on hostgator so if you are using a hostgator service, hosting/email or anything you have no other option but to restart router and get a new IP and then hope that IP is not blocked too.

  • This is as childish of a topic as it gets. You can’t complain on a dynamic IP. If i am on a dynamic IP and i get assigned an IP which i then use to bruteforce some website or to something else illegal or otherwise to anger the webmaster then they will surely BAN that IP address. This is not something you can blame on your ISP.

    If you are serious about surfing the web without headache’s then get a static IP, it only costs like Rs. 200 extra and you save yourself serious frustrations. A simplest example of this is that i can login to my application and keep logged in for upto a month because everytime i use it my IP is same and the cookie on my pc doesn’t need to be refreshed so it saves me time of relogging my username + password + authenticator code everytime as i can whitelist my IP easily. I have been using a static IP for around 5 years without a problem.

  • Zong needs to get its shit right – stupid company – they are injecting some java script which shows this tool bar while charging some premium rate. Stupid company

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