Countries - ISO-639, ISO-3166 countries codes with subdivisions and names, ISO-4217 currency designators, ITU-T E.164 IDD phone codes, countries capitals, UN M.49 codes, IANA ccTLD countries domains, FIPS, IOC/NOC and FIFA codes, VERY VERY FAST, compatible with Databases/JSON/BSON/GOB/XML/CSV, Emoji countries flags and currencies, Unicode CLDR.
The following files have the Sudan code set to 736 https://github.com/biter777/countries/blob/7b8b64334ecacdea9fd9dbd2d115a1f78bdc70a4/countries.go#L554 https://github.com/biter777/countries/blame/272527eec1cf53264796c3aaa1047afe2cee775b/countriesconst.go#L425
Per the ISO standard this should be 729 https://github.com/biter777/countries/blob/7b8b64334ecacdea9fd9dbd2d115a1f78bdc70a4/data/iso-codes/data_iso_3166-1.json#L1292 https://www.iso.org/obp/ui/#iso:code:3166:SD