2a03:5440::

Copenhagen · Denmark · Fiberby ApS

Registration lookup IPv6 address formats

Autonomous system: AS42541
Country: DK
Risk score: Not a probability

IP address summary

IP address: 2a03:5440::
ASN: AS42541
Network operator: Fiberby ApS
ISP: Fiberby ApS
Containing network profile: No indexed aggregate
Operator category: Home ISP

The containing profile is the nearest published aggregate. It is not a registry allocation or BGP ownership record.

Public ASN reference

Reference ASN: AS42541
Source label: FIBERBY Fiberby ApS
Reference interval: 2a03:5440:: to 2a03:5447:ffff:ffff:ffff:ffff:ffff:ffff
Collected: 2026-11-02

IPtoASN maps this address interval to AS42541. An interval is not necessarily a BGP prefix or registered allocation. It does not establish geolocation or ownership.

IPtoASN source Reference methodology

IP geolocation

World map with country boundaries — Approximate network location; not a device positionNatural Earth map data

Country: Denmark
City: Copenhagen
Region: Capital Region
Postal code: Not supplied
Timezone: Europe/Copenhagen
Local time: 2026-11-05 04:35:51
Approximate coordinates: 55.690, 12.557

Network-level coordinates do not identify a precise user or device location. How geolocation works

VPN, proxy and network signals

VPNNot listed

ProxyNot listed

TorNot classified

HostingNot classified

MobileNot classified

Risk score: 0

A low score is not proof that an address is safe.

Read exact field definitions

ASN and network operator

AS42541 profile

Organization: Fiberby ApS
ASN domain: fiberby.dk
Operator type: Home ISP

The ASN organization can differ from the organization using an individual address.

Network registration

Matching record range: 2a03:5440:: – 2a03:5440:0:100:ffff:ffff:ffff:ffff
Registered network name: FIBERBY-CORE
Registered network block: 2a03:5440::/48
Registration source: RIPENCC WHOIS
Company: Fiberby core infrastructure network
Usage type: residential
Company website: fiberby.dk

Registration and company fields describe this source record. They can differ from the ASN operator and from live routing announcements.

Abuse contact

Contact name: Fiberby Abuse
Published contact network: 2a03:5440::/48
Abuse email: abuse@fiberby.net
Phone: +45 61 67 80 14
Postal address: Fiberby ApS, Otto Busses Vej 5, 2450 København SV, Denmark
Contact country: Denmark

This contact is attached to the network record. Include the source IP, UTC timestamps and relevant logs when reporting abuse.

Actual API response

Open JSON

2a03:5440:: · live response

{
  "ip": "2a03:5440::",
  "isp": {
    "asn": "AS42541",
    "org": "Fiberby ApS",
    "isp": "Fiberby ApS"
  },
  "location": {
    "country": "Denmark",
    "country_code": "DK",
    "city": "Copenhagen",
    "state": "Capital Region",
    "zipcode": "",
    "latitude": 55.69019159981333,
    "longitude": 12.55669200912814,
    "timezone": "Europe/Copenhagen",
    "localtime": "2026-11-05T04:35:51"
  },
  "risk": {
    "is_mobile": false,
    "is_vpn": false,
    "is_tor": false,
    "is_proxy": false,
    "is_datacenter": false,
    "risk_score": 0
  }
}