There are many receivers now connected to the internet which can be used by listeners anywhere they have an internet connection. Most of these receivers are free to use. Some of them are simple stations with small antennas, but others are located in excellent quiet locations and have large antennas on tall towers. It can be entertaining and enlightening to compare the reception from different locations on different bands to hear how signal strength can vary. The IBP beacons provide a predictable signal of known power.
KiwiSDR is an inexpensive SDR receiver based on OpenWebRX created by John Seamons ZL/KF6VO. Most KiwiSDR owners connect their receiver to the internet, making it available for listeners to use. An IBP scanner is included in the user interface which makes it easy to track and monitor the IBP Beacons.
KiwiSDR receivers can be found at KiwiSDR Receivers Online. Currently there are 155 receivers online. If you want to hear what the beacons sound like and don't have a receiver, this is the easiest way to hear them in real time.
András Retzler HA7ILM created OpenWebRX and shares it with anyone who wants to connect a Software Defined Radio (SDR) to the internet. The web interface is easy to use and intuitive. To make it even easier for IBP beacon monitoring, there is a menu button which instantly tunes to the beacon frequency and shows the current transmitting beacon.
OpenWebRX receivers can be accessed from sdr.hu. Currently there are 171 receivers online.
Pieter-Tjerk de Boer PA3WFM has created the WebSDR software that allows users of SDR receivers to connect their radio to the internet and be used remotely. A filter form allows you to choose from receivers that cover one or more of the beacon frequencies and select the geographical region for the receiver location.
Select one of the CW modes and then type one of the beacon frequencies into the Frequency box. One of the nice features of WebSDR is the ability to record the audio received.
There are hundreds of web controlled receivers using the original technique of connecting a "real" radio to the server. Some are organized in groups and require registration. Others are individual projects. It was difficult to maintain a good set of links to these receivers as they are being replaced by the more flexible SDR systems above which allow for multiple users to listen on different frequencies in different modes thanks to the increased computer power available now.
If you are interested in tuning in with these receivers, Google web controlled ham receivers and you will find many links to try. Once you find a working receiver, change the mode to CW and listen on the beacon frequencies.