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I've been searching the documentation for the GUID for a Network Analysis Layer object. For example, "E156D7E5-22AF-11D3-9F99-00C04F6BC78E" is the Interface identifier for an IGeoFeatureLayer.

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The GUID for INALayer is 667B776B-5905-4450-9C94-18B214ECE8FB. This can be found in the registry by performing a search in RegEdit or programatically:

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Thank you so much, Adam! I appreciate it. – Renee Cammarere Mar 14 '11 at 13:48

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