**Exhibit 21.1**

 

**SUBSIDIARIES OF****VIANET.WORKS, INC.**

**CORPORATESTRUCTURE AS OF DECEMBER 31, 2004**

 

The following table indicates the name,subsidiary relationships and jurisdiction of formation of VIA NET.WORKS, Inc.direct and indirect subsidiaries.

 
| ** **                                | ** ** | **Jurisdiction of**                  |
|-------------------------------------------|------------|--------------------------------------|
| **Name**                                  | ** ** | **Formation**                        |
|                                      |       |                                 |
| **1. VIA NET.WORKS NY Corp**              |       | New York                             |
| **2. VIA NET.WORKS  Holdco, Inc.**   |       | Delaware                             |
|                                      | A.         | AMEN S.A.S.                          |   | France |
|                                      | B.         | AMEN Ltd.                            |   | UK |
|                                      | C.         | AMEN S.L. (100%)                     |   | Spain |
|                                      | D.         | PSINET                               |   | Netherlands |
|                                      |       | 1.                                   | PSINET Unix Support |   | Netherlands |
|                                      | E.         | PSINET Belgium BVBA/SPRL             |   | Belgium |
|                                      | F.         | PSINET Germany GmbH                  |   | Germany |
|                                      | G.         | PSINET Datacenter Germany GmbH       |   | Germany |
| **3. VIA NET.WORKS Europe  Holding B.V.** |       | Netherlands                          |
|                                      | A.         | AMEN NEDERLAND B.V                   |   | Netherlands |
|                                      | B.         | VIA NET.WORKS Nederland B.V.         |   | Netherlands |
|                                      | C.         | bART  Holding B.V.                   |   | Netherlands |
|                                      |       | 1.                                   | Home  Vision B.V. |   | Netherlands |
|                                      |       | 2.                                   | Xenovic B.V. |   | Netherlands |
|                                      |       |                                 | (a) | bART Noord Nederland |   | Netherlands |
|                                      |       |                                 | (b) | bART Midden Nederland |   | Netherlands |
|                                      |       |                                 | (c) | Arameta B.V. |   | Netherlands |
|                                      | D.         | VIA NET.WORKS Portugal               |   | Portugal |
|                                      |       | 1.                                   | AMEN Portugal |   | Portugal |
|                                      |       | 2.                                   | Expobyte Conferencias e Esposicoes S.A. |   | Portugal |
|                                      |       | 3.                                   | Surftrade Portugal |   | Portugal |
|                                      | E.         | VIA NET.WORKS Espana, S.L.           |   | Spain |
|                                      | F.         | VIA  NET.WORKS IRUCo. Ltd            |   | Ireland |
|                                      | G.         | VIA NET.WORKS Deutschland GmbH       |   | Germany |
|                                      | I .        | VIA NET.WORKS Holdco Italy S.R.L.    |   | Italy |
|                                      | J.         | VIA NET.WORKS France Holding S.A.S.  |   | France |
|                                      |       | 1.                                   | PSINET France Sarl |   | France |
|                                      |       | 2.                                   | VIA NET.WORKS France S.A. |   | France |
|                                      | K.         | VIA  NET.WORKS (Schweiz) AG          |   | Switzerland |
|                                      |       | 1.                                   | PSINET Switzerland Sarl |   | Switzerland |
|                                      | L.         | VIA NET.WORKS Express B.V.           |   | Netherlands |
|                                      | M.         | VIA NET.WORKS UK Holding Ltd.        |   | UK |
|                                      |       | 1.                                   | VIA NET.WORKS Jersey Ltd |   | Jersey |
|                                      |       | 2.                                   | VIA NET.WORKS Italia Holdco |   | Italy |
|                                      | N.         | VIA  NET.WORKS Deutsche Holding GmbH |   | Germany |
| **4. VIA NET.WORKS  USA, Inc.**      |       | Georgia                              |
| **5. Surftrade U.S.A., Inc**              |       | Delaware                             |
|                                      | A          | SurfTrade Ltda (Brasil)              |   | Brasil |

 

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