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Phone 2 Location
Resolve any telephone number to its geographic location.
It not only tells the location but the operator also.
Magic-Net Full Online DNS Lookup
DNS Search engine from Magic-NET. Full DNS records lookup, MX records lookup, Reverse lookup, PTR, rDNS, SPF records, Subdomains lookup, Multiple blacklist check, Zone Transfers.
IPduh Apropos
IPduh Apropos Search. Apropos may be used as an Internet Forensics Search Engine or a General Purpose Search Engine.
UPC Lookup
UPC Database Lookup Search Plugin uses the UPCDatabase.com UPC Database to lookup product names and prices.
RAE dictionary lookup, unofficial version
Real Academia Española dictionary lookup.
To create your own collections, you must have a Mozilla Add-ons account.