Arelion (Telia Carrier) network profile

Arelion: from Telia Carrier to an independent Tier 1

Arelion is the Stockholm-headquartered global IP backbone and wholesale-transit operator previously known as Telia Carrier. The business was the international wholesale arm of Telia Company (the Swedish-Finnish telecom incumbent that resulted from the 2002 merger of Telia AB and Sonera) and operated continuously as a widely recognized Tier 1 backbone for several decades under the Telia Carrier brand. In 2021 Telia Company sold the carrier business to Polhem Infra, a Nordic infrastructure investment vehicle backed by Swedish pension funds, and the business was rebranded as Arelion later the same year.

The divestment was structured to keep the carrier business operationally intact while separating it from the Telia Company consumer- and-enterprise group, which retained the residential and business retail operations across Nordic and Baltic markets under the Telia brand. The result is that "Telia" today (post-2021) refers to the consumer-and- enterprise retail business, while "Arelion" refers to what was previously the carrier backbone — a clean operational and brand separation that matters significantly for attribution work because the two share part of the historic ASN identity but operate as independent businesses with separate ownership.

AS1299 and the IPv4 routes leadership

Arelion's primary autonomous system is AS1299, the Telia Carrier legacy ASN that has been retained through the rebrand and the ownership change. AS1299 has historically led the global ranking of Tier 1 backbones by IPv4 BGP-route count and by customer-cone size, often described as the "biggest" Tier 1 by the CAIDA AS-rank metric. Several years AS1299 has held the top position in published Tier 1 rankings depending on the specific measurement, alongside AS3356 (Lumen, formerly Level 3) and AS174 (Cogent).

The customer cone reflects two structural advantages of the historic Telia Carrier business. First, an aggressive global network build-out in the late 1990s and 2000s that extended fiber and points-of-presence across all major regions. Second, a notably open peering posture (described below) that produced broad settlement-free interconnection and correspondingly broad reachability from AS1299. The Polhem Infra ownership has not changed either of these structural advantages and AS1299 has retained its top-tier ranking through the rebrand.

Hostname conventions and legacy Telia signatures

AS1299 backbone-router hostnames historically used the telia.net domain in structured patterns such as NN-X-Y.bb1.kbn.net.telia.net or arelion-X.example.net.telia.net encoding interface, router, city, and network segment. The PTR signature on telia.net remains in active use despite the Arelion rebrand and is one of the most recognizable Tier 1 backbone identifiers in any traceroute. New Arelion-issued infrastructure increasingly uses arelion.com domains alongside the legacy telia.net hostnames, with a transition that is operationally invisible at the routing layer.

For trace and attribution work the legacy PTR signature on telia.net is the more useful identifier for the time being because most existing infrastructure still resolves to that domain. A traceroute showing a sequence of telia.net hops can be read directly for the inter-city path through AS1299, with city codes encoded in three- or four-character abbreviations consistent with European telecom naming conventions. Customer-issued IP space announced through AS1299 manages its own reverse DNS, so PTRs on downstream-customer prefixes do not typically use telia.net hostnames.

Peering policy and the broad-reachability advantage

Arelion (and historically Telia Carrier) has maintained one of the more open peering policies among major Tier 1 backbones, accepting settlement-free peering with a broad range of counterparties including regional operators that would not meet the stricter requirements of Cogent or some other Tier 1 networks. The open peering posture produced broad settlement-free interconnection across all major regions and is one of the structural reasons AS1299 has consistently ranked at or near the top of Tier 1 customer-cone rankings.

The peering posture has occasionally produced friction with peers whose policies are stricter, including the well-known Cogent disputes described in the Cogent provider entry. From the Arelion side these disputes have been less frequent and less publicly contentious than Cogent's pattern, and AS1299 generally enjoys stable broad-reachability across both IPv4 and IPv6 routing tables. Operators selecting AS1299 as a transit provider typically value the peering breadth as a major factor in the decision.

IPv6 deployment and dual-stack maturity

IPv6 deployment on AS1299 is comprehensive and long-standing. Arelion supports native IPv6 BGP transit to wholesale customers and has full IPv6 routing-table coverage across its long-haul network. The IPv6 deployment is one of the more mature in the Tier 1 backbone market, and there is no significant IPv4-versus- IPv6 reachability asymmetry of the kind that affects Cogent's IPv6 paths through the unresolved Hurricane Electric dispute.

For wholesale customers selecting AS1299 as transit, the dual-stack baseline is among the most reliable in the Tier 1 market. IPv6 transit through Arelion does not require special engineering accommodations relative to IPv4, which is one of the reasons AS1299 is frequently included as a primary IPv6 transit option for content providers and enterprise customers prioritizing IPv6-ready interconnection.

European and transatlantic strength

Among Tier 1 backbones, Arelion has historically been one of the strongest in European and transatlantic routing, reflecting the Telia Company home market in the Nordic region and the extensive long-haul fiber investment across Northern, Central, and Western Europe. Major European interconnection points (Stockholm, Frankfurt, Amsterdam, London, Paris) are all well-covered by AS1299, and transatlantic capacity between Europe and North America is substantial through both Arelion-owned and consortium-owned submarine cable systems.

The Asia-Pacific footprint is more limited than NTT's and typically relies on partner interconnection for non-Singapore, non-Tokyo destinations. Latin American coverage is also more partner-dependent than wholly-owned. For attribution work the implication is that AS1299 paths through Europe and across the Atlantic are likely direct on Arelion infrastructure, while paths to Asia or Latin America may traverse partner networks downstream of AS1299 — a property of the backbone, not of the traffic riding it.

Internet exchange point participation and the open-network model

Arelion participates in essentially every major internet exchange point (IXP) across Europe and North America, including DE-CIX Frankfurt, AMS-IX Amsterdam, LINX London, Equinix Internet Exchange fabrics, NetIX, and the Stockholm STHIX. The IXP-rich peering strategy is one of the operational advantages built on the open peering policy and is one of the reasons AS1299 reaches such a broad range of peers without commercial transit arrangements. The Stockholm presence in particular is structurally important because Stockholm-area data centers and IXPs have become one of the more active Northern European interconnection hubs.

For attribution and operational analysis the IXP-heavy peering posture means traffic flows between AS1299 and most major peers are likely to be carried directly across IXP fabrics rather than across private transit. Path-engineering behavior on AS1299 reflects that interconnection density. The IXP relationships also produce a recurring presence of Arelion-tagged infrastructure in IXP route servers and in the published IXP member lists, which is one of the easier ways to verify Arelion's operational footprint at a given metro market.

Submarine cable participation and global links

Arelion's transatlantic and other long-distance capacity is supported by a mix of wholly-owned long-haul terrestrial fiber, leased capacity, and partial ownership in submarine cable consortia. The submarine portfolio links Northern Europe to the United Kingdom, the United Kingdom to North America, and Europe to the Middle East and onward to Asia. Consortium-style ownership is the dominant model for new transatlantic submarine capacity in the 2020s, and Arelion's participation in newer-generation submarine systems keeps AS1299 competitive on latency and capacity between Europe and North America against hyperscaler-built private subsea systems.

From an attribution standpoint the submarine footprint means AS1299 paths between Stockholm and the US East Coast typically reflect direct transatlantic routing rather than indirect transit through intermediate networks. Latency benchmarks on AS1299 between European and North American points-of-presence are competitive with the best available routes, and AS1299 is frequently included as a primary transit option when latency-sensitive transatlantic connectivity is a design requirement.

The ownership change and what it does not affect

The Polhem Infra ownership of Arelion since 2021 is unusual for a Tier 1 backbone. Most global backbones are owned by larger telecom groups (NTT, Lumen, Cogent listed equity) or by private-equity portfolios. Polhem Infra is a Swedish infrastructure investment vehicle backed by national pension funds and other long-term institutional capital, which produces an ownership model closer to the regulated utility-style capital structure than to the traditional telecom-conglomerate model. The practical implication is that Arelion's capital expenditure cadence and pricing strategy are shaped by long-term infrastructure-investor expectations rather than by quarterly listed- equity earnings pressure.

For attribution and operational purposes the ownership change does not affect AS1299 routing behavior, peering policy, customer cone, or PTR conventions. The legal entity behind WHOIS abuse contacts has changed from Telia Company to Arelion AB, and abuse complaints should now route to Arelion-published contacts rather than Telia Company. Tooling and documentation written before 2021 commonly still references the Telia Carrier brand, which is the most common attribution-database lag affecting AS1299.

Downstream-customer attribution

As with any Tier 1 backbone, the bulk of AS1299 attribution issues stem from downstream-customer IP space being labeled at the upstream-backbone level. Arelion announces thousands of customer prefixes belonging to regional ISPs, hosting providers, content companies, and enterprise corporate networks across all major regions. The upstream "Arelion" or "Telia" attribution is correct at the BGP level but rarely identifies the operational owner of the specific prefix.

The correct attribution workflow for any AS1299-tagged IP is to consult prefix-level WHOIS in RIPE (or ARIN where applicable) to identify the downstream customer actually responsible for the IP space. Abuse complaints should route to the prefix-level abuse contact rather than to Arelion's network operations center, which will typically redirect non- backbone-specific complaints back to the downstream-customer abuse contact identified in the prefix WHOIS record.

Investigation pitfalls specific to Arelion IPs

Several attribution traps recur with AS1299 IPs. First, the "Telia" label in older WHOIS records, traceroutes, and geolocation databases refers to the historic Telia Carrier business that is now Arelion — not to the still-existing Telia Company consumer-and-enterprise retail business that retained the Telia brand after the 2021 split. Second, AS1299's downstream-customer cone is large, and the upstream-backbone label rarely identifies the operational owner of a specific prefix.

Third, the Polhem Infra ownership change is recent and some third-party databases still reference Telia Company as the operator of record, even though abuse and operational contacts have moved to Arelion AB. Fourth, Arelion is a backbone and wholesale-transit operator, not a consumer ISP — an IP attributed to "Arelion" or "Telia Carrier" is essentially never a residential subscriber. Fifth, the telia.net PTR domain is still in active use despite the rebrand, so its presence in hostnames does not indicate stale data.

Quick reference summary

Arelion is a Stockholm-headquartered global Tier 1 IP backbone, formerly known as Telia Carrier, divested from Telia Company in 2021 to Polhem Infra. AS1299 has historically led the Tier 1 ranking by IPv4 BGP-route count and customer-cone size and continues to operate under the same identity. The telia.net PTR domain is still the most common signature on AS1299 backbone routers despite the rebrand to Arelion. IPv6 deployment is comprehensive and broadly reachable.

The 2021 ownership change separates the now-Arelion carrier business from the still-existing Telia Company consumer retail business that retained the Telia brand. For per-IP attribution on AS1299-tagged ranges, pair an ASN lookup with a WHOIS lookup at the prefix level to identify the actual downstream operator behind an Arelion-announced IP, and update legacy "Telia Carrier" references to Arelion AB for current abuse and operational contacts.

The combination of open peering, dense IXP participation, comprehensive IPv6, and the long-haul fiber footprint underpins Arelion's recurring presence in published Tier 1 rankings, but those rankings measure backbone structural position rather than end-user behavior. As with every Tier 1 provider in this category, the operational identity of an AS1299 IP almost always belongs to a downstream customer rather than to Arelion itself, and treating the backbone label as the operational owner is the single most common attribution error in this corner of the data. The Arelion brand has been live for several years now, so new operational documentation increasingly uses the current name, but older runbooks and vendor lists may continue to reference Telia Carrier for years to come — recognize both labels as referring to AS1299 under current Polhem Infra ownership, with Arelion AB as the operational legal entity.