POP3 on Untrusted Network

Open ports statistics for 2021

Jan Kopriva — Wed, 05 Jan 2022 07:30:00 +0200

The year 2021 is behind us which means that the time has come for us to take a look at how the internet changed over its 365 days.

As always, the data, on which the following charts are based, have been gathered using Shodan. Therefore bear in mind that although the charts should give us a good enough view of more significant changes, they may not be completely accurate (see the first post with quarterly statistics.

It should be mentioned that since Shodan started offering a new service called Trends few months back, which enables one to quickly view similar charts as the ones bellow for arbitrary search queries, this may be the last post in the “Open port statistics” series, since these are somewhat superfluous given the new service… Althoug, since Shodan Trends displays only “high-level” charts with significantly lower level of precission (it seems that it uses either an average or a median for each month, whereas the following charts show precise values returned by Shodan on each day in the year), maybe I’ll decide to keep posting these at least on a yearly basis - we’ll see…

Should you be interested in the port situation in the Czech Republic, you may find corresponding charts here.

Bellow, you may find charts for the following protocols and ports:

Web

E-mail

SSL/TLS

Industrial Control Systems (ICS)

SSH (port 22)

Telnet (port 23)

DNS (port 53)

NTP (port 123)

SNMP (port 161)

SMB (port 445)

RDP (port 3389)

Web

HTTP (port 80)

HTTPS (port 443)

TLS 1.3 (port 443)

TLS 1.2 (port 443)

TLS 1.1 (port 443)

TLS 1.0 (port 443)

SSL 3.0 (port 443)

SSL 2.0 (port 443)

E-mail

SMTP (port 25)

SMTPS (port 465)

IMAP (port 143)

IMAPS (port 993)

POP3 (port 110)

POP3S (port 995)

SSL/TLS

TLS 1.3 (all ports)

TLS 1.2 (all ports)

TLS 1.1 (all ports)

TLS 1.0 (all ports)

SSL 3.0 (all ports)

SSL 2.0 (all ports)

Industrial Control Systems

All ICS protocols

Modbus (port 502)

EIBnet/IP (port 3671)

BACnet/IP (port 47808)

Open ports statistics for Q3 2021

Jan Kopriva — Fri, 01 Oct 2021 15:00:00 +0200

Only the last three months remain until the end of 2021, which means it’s time for a look at how the internet as a whole changed in the third quarter of the year.

Should you be interested in the port situation in the Czech Republic, you may find corresponding charts here.

Bellow, you may find charts for the following protocols and ports:

Web

E-mail

SSL/TLS

Industrial Control Systems (ICS)

SSH (port 22)

Telnet (port 23)

DNS (port 53)

NTP (port 123)

SNMP (port 161)

SMB (port 445)

RDP (port 3389)

Web

HTTP (port 80)

HTTPS (port 443)

TLS 1.3 (port 443)

TLS 1.2 (port 443)

TLS 1.1 (port 443)

TLS 1.0 (port 443)

SSL 3.0 (port 443)

SSL 2.0 (port 443)

E-mail

SMTP (port 25)

SMTPS (port 465)

IMAP (port 143)

IMAPS (port 993)

POP3 (port 110)

POP3S (port 995)

SSL/TLS

TLS 1.3 (all ports)

TLS 1.2 (all ports)

TLS 1.1 (all ports)

TLS 1.0 (all ports)

SSL 3.0 (all ports)

SSL 2.0 (all ports)

Industrial Control Systems

All ICS protocols

Modbus (port 502)

EIBnet/IP (port 3671)

BACnet/IP (port 47808)

Open ports statistics for Q2 2021

Jan Kopriva — Wed, 30 Jun 2021 21:15:00 +0200

The first half of 2020 is behind us, which means it’s time for a look at how the internet as a whole changed during the past 3 months.

Should you be interested in the port situation in the Czech Republic, you may find corresponding charts here.

Bellow, you may find charts for the following protocols and ports:

Web

E-mail

SSL/TLS

Industrial Control Systems (ICS)

SSH (port 22)

Telnet (port 23)

DNS (port 53)

NTP (port 123)

SNMP (port 161)

SMB (port 445)

RDP (port 3389)

Web

HTTP (port 80)

HTTPS (port 443)

TLS 1.3 (port 443)

TLS 1.2 (port 443)

TLS 1.1 (port 443)

TLS 1.0 (port 443)

SSL 3.0 (port 443)

SSL 2.0 (port 443)

E-mail

SMTP (port 25)

SMTPS (port 465)

IMAP (port 143)

IMAPS (port 993)

POP3 (port 110)

POP3S (port 995)

SSL/TLS

TLS 1.3 (all ports)

TLS 1.2 (all ports)

TLS 1.1 (all ports)

TLS 1.0 (all ports)

SSL 3.0 (all ports)

SSL 2.0 (all ports)

Industrial Control Systems

All ICS protocols

Modbus (port 502)

EIBnet/IP (port 3671)

BACnet/IP (port 47808)

Open ports statistics for Q1 2021

Jan Kopriva — Mon, 05 Apr 2021 11:30:00 +0200

The first quarter of 2020 is behind us, which means it’s time for another look at some of the interesting ports accessible on public IPs. This time however, we will take a look at how the internet as a whole changed during the past 3 months in terms of accessible ports, but also at specific changes related to support of different versions of SSL and TLS.

Should you be interested in the port situation in the Czech Republic, you may find corresponding charts here.

Bellow, you may find charts for the following protocols and ports:

Web

E-mail

SSL/TLS

Industrial Control Systems (ICS)

SSH (port 22)

Telnet (port 23)

DNS (port 53)

NTP (port 123)

SNMP (port 161)

SMB (port 445)

RDP (port 3389)

Web

HTTP (port 80)

HTTPS (port 443)

TLS 1.3 (port 443)

TLS 1.2 (port 443)

TLS 1.1 (port 443)

TLS 1.0 (port 443)

SSL 3.0 (port 443)

SSL 2.0 (port 443)

E-mail

SMTP (port 25)

SMTPS (port 465)

IMAP (port 143)

IMAPS (port 993)

POP3 (port 110)

POP3S (port 995)

SSL/TLS

TLS 1.3 (all ports)

TLS 1.2 (all ports)

TLS 1.1 (all ports)

TLS 1.0 (all ports)

SSL 3.0 (all ports)

SSL 2.0 (all ports)

Industrial Control Systems

All ICS protocols

Modbus (port 502)

EIBnet/IP (port 3671)

BACnet/IP (port 47808)

Open ports statistics for 2020

Jan Kopriva — Fri, 01 Jan 2021 17:00:00 +0200

The last quarter of 2020 is behind us, which means it’s time for another look at some of the interesting ports accessible on public IPs. This time however, we will take a look at how the internet changed during the whole of 2020, not just at the past 3 months.

I would especially like to bring to your attention the steady decrease in ICS systems connected to the internet during 2020. Although Shodan still sees almost 100k of IP addresses running services communicating using industrial protocols, it is over 30k less then it saw at the beginning of the year.

Should you be interested in the port situation in the Czech Republic, you may find corresponding charts here.

Bellow, you may find charts for the following protocols and ports:

Web

E-mail

Industrial Control Systems (ICS)

SSH (port 22)

Telnet (port 23)

DNS (port 53)

NTP (port 123)

SNMP (port 161)

SMB (port 445)

RDP (port 3389)

HTTP (port 80)

HTTPS (port 443)

SMTP (port 25)

SMTPS (port 465)

IMAP (port 143)

IMAPS (port 993)

POP3 (port 110)

POP3S (port 995)

All ICS protocols

Modbus (port 502)

EIBnet/IP (port 3671)

BACnet/IP (port 47808)

Open ports statistics for Q3 2020

Jan Kopriva — Wed, 30 Sep 2020 07:30:00 +0200

If you’ve read any of my posts about open ports on public IP addresses either here or on the SANS Internet Storm Center website, you probably know that I’m interested in how the internet changes over time and I try to gain at least some understanding of it by analyzing data gathered over time from Shodan.

To this end, I’ve been gathering daily statistics of different open ports/running services accessible on public IP addresses around the world and in different countries for about 18 months now. In order to acquire this data, I wrote Python tool (which I’ve called “TriOp” for obvious reasons), that enables me to quickly create reusable batches of queries for Shodan and automatically gather the numbers of IP addresses, which satisfy these queries. I plan to open source the tool in the future, but I will first need to find some time to clean up the code a little, as although it works just fine in its current version, it is a bit too spaghetti-like in some places for my liking…

In any case, since I have access to this data and I’m probably not the only one who finds the changes in numbers of different open ports interesting, I’ve decided to start publishing quarterly (and perhaps yearly) charts of the numbers of IPs, which have some of the more interesting ports open to the internet.
The list of ports is intentionally small, but if you’d like to see a chart for any of the missing ones next quarter, let me know and I’ll consider adding it.

I should mention that due to the way Shodan works, the numbers gathered from it may sometimes increase or decrease sharply and take a while to stabilize (see the first week of September in any of the charts bellow), which does not necessarily represent the real state of affairs. Short discussion of this issue may be found here. To alleviate this issue to at least some degree, I’ve included relative (i.e. percentage of IPs Shodan sees, which have a specific port open) as well as absolute values in all the charts.

Given the limitations of Shodan and the fact that (except for ICS data) the values in the charts are gathered using only port queries (i.e. “port:80”) and are not limited by any service specification, they may be slightly imprecise. Still, the results are certainly interesting and provide at least somewhat accurate look at how the internet changes over time.

Bellow, you may find charts for the following protocols and ports:

Web

E-mail