The mapping below uses MaxMind's GeoIP2 web service response schema (Country, City, Insights, Enterprise, plus the standalone Anonymous IP, Connection Type, ISP and Domain databases). Nested fields are written in dot notation (location.latitude) to match MaxMind's documentation.

Where a mapping is approximate, the Notes column calls it out. Where no equivalent exists, the cell is blank.

Continent, country, registered/represented country

MaxMind field	51Degrees property	Notes
`continent.code`	`ContinentCode2`
`continent.names.{locale}`	`ContinentName`	51Degrees returns the English name; localized names are not exposed as separate properties.
`continent.geoname_id`		51Degrees does not use GeoNames identifiers.
`country.iso_code`	`CountryCode`	Use `CountryCode3` for ISO 3166-1 alpha-3.
`country.names.{locale}`	`Country`
`country.is_in_european_union`	`IsEu`
`country.confidence`	`LocationConfidence`	MaxMind exposes confidence per geographic level (country, city, subdivision, postal); 51Degrees rolls them up into a single string-valued `LocationConfidence`. See the note below the City/postal/location table.
`country.geoname_id`
`registered_country.iso_code`	`RegisteredCountry`
`registered_country.names.{locale}`	`RegisteredCountry`	51Degrees returns the country only, not localized names.
`represented_country.*`		51Degrees does not separately model represented country (US military bases etc.).

Subdivision (state / region)

MaxMind field	51Degrees property	Notes
`subdivisions[0].iso_code`	`Iso31662Lvl4SubdivisionOnly`	Use `Iso31662Lvl4` for the `CC-SUB` form.
`subdivisions[0].names.{locale}`	`State` or `Region`	`State` for the higher-level subdivision (US states, UK countries); `Region` for the next level down.
`subdivisions[0].confidence`	`LocationConfidence`	See the note below the City/postal/location table.
`subdivisions[0].geoname_id`

City, postal, location

MaxMind field	51Degrees property	Notes
`city.names.{locale}`	`Town`
`city.confidence`	`LocationConfidence`	See the note below this table.
`city.geoname_id`
`postal.code`	`ZipCode`
`postal.confidence`	`LocationConfidence`	See the note below this table.
`location.latitude`	`Latitude`	51Degrees returns a single averaged value. See coordinate randomization note below.
`location.longitude`	`Longitude`	51Degrees returns a single averaged value. See coordinate randomization note below.
`location.accuracy_radius`	`AccuracyRadiusMax`	Use `AccuracyRadiusMin` for the inner-bound radius. See the `LocationConfidence` note below for the categorical confidence signal that complements these radii.
`location.time_zone`	`TimeZoneIana`	`TimeZoneOffset` gives UTC offset separately.
`location.metro_code`		Deprecated by MaxMind; no 51Degrees equivalent.
`location.average_income`		No equivalent.
`location.population_density`		No equivalent.

Coordinate randomization: 51Degrees randomizes Latitude and Longitude within around 1 km of the true average location for the IP range. The randomization is applied during data file generation, so the value returned for a given IP address is stable across all lookups against the same data file and only changes when a new data file is published. This guarantees the coordinates cannot be classified as personal data. No other property is affected. See Randomization.

Location confidence: 51Degrees rolls up location certainty into a single string-valued LocationConfidence property covering the town and country. Where MaxMind exposes a numeric *.confidence score on each geographic level (country.confidence, city.confidence, subdivisions[0].confidence, postal.confidence), the categorical 51Degrees equivalent is LocationConfidence, complemented by the numeric AccuracyRadiusMax and AccuracyRadiusMin properties for spatial precision. See the property dictionary for the set of possible values.

Traits (network and ASN)

MaxMind field	51Degrees property	Notes
`traits.ip_address`	`Ip` / `IpV6`
`traits.network`	`IpRangeStart` + `IpRangeEnd`	MaxMind returns CIDR; 51Degrees returns explicit start and end addresses.
`traits.autonomous_system_number`	`Asn`
`traits.autonomous_system_organization`	`AsnName`
`traits.isp`	`AsnName`	51Degrees does not separate ISP from AS organization.
`traits.organization`	`RegisteredOwner`
`traits.domain`		No equivalent.
`traits.connection_type`	`ConnectionType`	Both classify Cable/DSL, Cellular, Corporate, Satellite, Hosting (51Degrees rolls hosting and anonymous into one category). `IsBroadband`, `IsCellular`, `IsHosted` give the same information as booleans.
`traits.mobile_country_code`	`Mcc`
`traits.mobile_network_code`		Not exposed as a separate property.
`traits.is_anycast`		No equivalent.
`traits.user_type`		Approximate via `ConnectionType` plus `IsCellular` / `IsHosted`; no business / college / school classification.
`traits.user_count`		No equivalent.
`traits.static_ip_score`		No equivalent.
`traits.ip_risk_snapshot`		Differs in semantics. `HumanProbability` is the closest signal. It returns confidence from 0 to 10 that traffic is from a human rather than hosting or automated infrastructure.

Anonymizer (privacy / VPN)

MaxMind field	51Degrees property	Notes
`anonymizer.is_anonymous`	`IsVPN` \| `IsProxy` \| `IsTor`	MaxMind's umbrella flag; 51Degrees exposes each anonymizer type separately.
`anonymizer.is_anonymous_vpn`	`IsVPN`
`anonymizer.is_hosting_provider`	`IsHosted`
`anonymizer.is_public_proxy`	`IsProxy`
`anonymizer.is_residential_proxy`	`IsProxy`	51Degrees does not distinguish residential proxies from public proxies.
`anonymizer.is_tor_exit_node`	`IsTor`
`anonymizer.confidence`
`anonymizer.network_last_seen`
`anonymizer.provider_name`

Properties unique to 51Degrees

The following 51Degrees properties have no MaxMind equivalent. They are the additional context that drives accuracy weighting, country diversity and bot detection.

Weighted country lists: CountryCodesGeographical, CountryCodesPopulation, and their *All and *Translated variants return every candidate country with weightings, not a single best-guess. See Countries.
Diversity scores: BrowserDiversity, HardwareDiversity, PlatformDiversity quantify how varied the traffic from an IP range is. See Diversity.
Bot identification: IsCrawler, IsArtificialIntelligence, CrawlerName, CrawlerProductTokens, CrawlerUrl, CrawlerUsage.
Human probability: HumanProbability returns a score from 0 to 10. See Human.
Probabilistic identifiers: IdProbGlobal, IdProbLic.

51Degrees API Documentation 4.5

From MaxMind