Here are a few Tracking URLs as I have found them. Please e-mail me at henrik at eshipguy.com or comment on this down below if you have any issues or you have any you want to share!
Common Carriers:
UPS: http://wwwapps.ups.com/WebTracking/track?HTMLVersion=5.0&loc=en_US&Requester=UPSHome&trackNums=[Insert Tracking No Here]&track.x=Track
FedEx: http://fedex.com/Tracking?action=track&tracknumber_list=[Insert Tracking No. Here]&cntry_code=us
USPS: http://trkcnfrm1.smi.usps.com/PTSInternetWeb/InterLabelInquiry.do?origTrackNum=[Insert Tracking No. Here]
New USPS: https://tools.usps.com/go/TrackConfirmAction?qtc_tLabels1=[Insert Tracking No. Here]
OnTrack: http://www.ontrac.com/tracking.asp?trackingres=submit&tracking_number=[Insert Tracking No. Here]&trackBtn.x=18&trackBtn.y=12&trackBtn=trackingres_submit
LTL Carriers:
ABF: https://www.abfs.com/tools/trace/default.asp?hidSubmitted=Y&refno0=[tracking_numbe]&reftype0=A
Old Dominion Freight (ODFL): http://www.odfl.com/trace/Trace.jsp?pronum=[Insert Pro No. Here]
Roadway / Yellow (aka yrc) (RDWY): http://my.yrc.com/dynamic/national/servlet?CONTROLLER=com.rdwy.ec.rextracking.http.controller.ProcessPublicTrackingController&PRONumber=%1
More Information here: http://www.yrc.com/e_commerce/hyperlinks.html
Priority Solutions: https://www.paxtracks.com/TrackingQuery.asp?c=[Customer Group]%20&u=[USER ID]&p=[Password]&f=B&v=OA[PRO No.]
CAL State Express: http://www.calstatexpress.com/scripts/cgiip.exe/protrace.htm?pro=[Pro. no Here]&language=&nav=side#
