diff --git a/beacon_chain/spec/eip7594_helpers.nim b/beacon_chain/spec/eip7594_helpers.nim
index 3847a3197..1e9505c7d 100644
--- a/beacon_chain/spec/eip7594_helpers.nim
+++ b/beacon_chain/spec/eip7594_helpers.nim
@@ -39,8 +39,11 @@ proc get_custody_columns*(node_id: NodeId, custody_subnet_count: uint64): Result
     current_id = node_id
 
   while subnet_ids.len < int(custody_subnet_count):
-    let subnet_id_bytes = eth2digest(current_id.toBytesLE().toOpenArray(0,8))
-    var subnet_id = bytes_to_uint64(subnet_id_bytes.data) mod 
+
+    var subnet_id_bytes: array[8, byte]
+    subnet_id_bytes[0..7] = current_id.toBytesLE().toOpenArray(0,7)
+
+    var subnet_id = bytes_to_uint64(subnet_id_bytes) mod 
         DATA_COLUMN_SIDECAR_SUBNET_COUNT
     
     if subnet_id notin subnet_ids:
diff --git a/tests/consensus_spec/test_fixture_networking.nim b/tests/consensus_spec/test_fixture_networking.nim
new file mode 100644
index 000000000..af6b9675a
--- /dev/null
+++ b/tests/consensus_spec/test_fixture_networking.nim
@@ -0,0 +1,95 @@
+# beacon_chain
+# Copyright (c) 2024 Status Research & Development GmbH
+# Licensed and distributed under either of
+#   * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT).
+#   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
+# at your option. This file may not be copied, modified, or distributed except according to those terms.
+
+{.push raises: [].}
+{.used.}
+
+import
+  std/[json, streams],
+  yaml,
+  kzg4844/kzg_ex,
+  stint,
+  chronicles,
+  eth/p2p/discoveryv5/[node],
+  stew/[byteutils, results],
+  ../../beacon_chain/spec/eip7594_helpers,
+  ../testutil,
+  ./fixtures_utils, ./os_ops
+
+from std/sequtils import anyIt, mapIt, toSeq
+from std/strutils import rsplit
+
+func toUInt64(s: SomeInteger): Opt[uint64] =
+  if s < 0:
+    return Opt.none uint64
+  try:
+    Opt.some uint64(s)
+  except ValueError:
+    Opt.none uint64
+
+# func toUInt256(s: SomeInteger): Opt[UInt256] =
+#   if s < 0:
+#     return Opt.none UInt256
+#   try:
+#     Opt.some u256(s)
+#   except ValueError:
+#     Opt.none
+
+func fromHex[N: static int](s: string): Opt[array[N, byte]] =
+  if s.len != 2*(N+1):
+    # 0x prefix
+    return Opt.none array[N, byte]
+
+  try:
+    Opt.some fromHex(array[N, byte], s)
+  except ValueError:
+    Opt.none array[N, byte]
+
+proc runGetCustodyColumns(suiteName, path: string) =
+  let relativePathComponent = path.relativeTestPathComponent()
+  test "Networking - Get Custody Columns - " & relativePathComponent:
+    type TestMetaYaml = object
+      node_id: string
+      custody_subnet_count: uint64
+      result: Option[seq[uint64]]
+    let
+      meta = block:
+        var s = openFileStream(path/"meta.yaml")
+        defer: close(s)
+        var res: TestMetaYaml
+        yaml.load(s, res)
+        res
+      node_id = UInt256.fromDecimal(meta.node_id)
+      custody_subnet_count = toUInt64(meta.custody_subnet_count)
+      reslt = (meta.result.get).mapIt(uint64(it))
+
+    if custody_subnet_count.isNone:
+      check meta.result.isNone
+    else:
+      let columns = get_custody_columns(node_id, custody_subnet_count.get)
+      if columns.isErr:
+        check meta.result.isNone
+      else:
+        var count = 0
+        for column in columns.get:
+          check column == uint64(reslt[count])
+          count = count + 1
+
+from std/algorithm import sorted
+
+var suiteName = "EF - EIP7594"
+
+suite "EF - EIP7594 - Networking" & preset():
+  const presetPath = SszTestsDir/"minimal"
+  let basePath =
+    presetPath/"eip7594"/"networking"/"get_custody_columns"/"pyspec_tests"
+  for kind, path in walkDir(basePath, relative = true, checkDir = true):
+    runGetCustodyColumns(suiteName, basePath/path)
+
+
+    
+        
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