can wireshark be installed on an iPad or iPhone?

(Wireshark isn't a Web app, so it can't be installed in Safari or any other Web browser.)

There is no version of Wireshark that runs on iOS, so it can't be installed on an iPad or an iPhone or an iPod touch. By default, in order to capture packets, a program needs to run as the superuser on Darwin-based operating systems such as OS X and iOS. On OS X, the Wireshark installer modifies the system so that the user has sufficient privilege to capture packets; Apple's App Store restrictions prevent Wireshark from being able to do that on iOS.

In theory, a version of Wireshark for jailbroken iPads and iPhones and iPod touches (and perhaps jailbroken second-generation Apple TVs) could be created, but nobody's done so yet.

Unless Apple adds the ability for "approved" applications to capture network traffic on machines running iOS, only jailbroken iOS machines will be able to run applications that capture network traffic.

There's no way to do captures directly on the iPad, but you CAN view captures in mobile browsers using CloudShark (www.cloudshark.org). There's a plug-in for Wireshark to directly upload to CloudShark as well.

On jailbroken devices, you CAN capture network traffic, directly on the device AND in PCAP format, by installing an application called "Pirni" from the Cydia store. It's a command-line application, so a terminal application (i.e. Prompt) is required.

For information on usage, i suggest entering "Pirni" at the command-line, followed by an <enter>.

After the capture, you can transfer the PCAP file to any computer (using an SSH client), running wireshark, to analyze the data. Alternatively, you can upload it directly from your device, to cloudshark.org, BUT... in order to do this, you need to have the "safari upload enabler" installed. You can find it in the Cydia store.

A solution can be to intercept the traffic of your mobile or tablet. On Mac OS X, you can use a tool such as Debookee to intercept the traffic and then see all the traffic and protocols, more easy to use than Wireshark, but less details.