Lots of snakes are brown and black. You'd need to be more specific about the patterning, size, head shape, and location you spotted the snake to get a good answer.
cobra
black snake
blackish brownish snake
What kind of snake is this
It depends on the snake. They can be blue, to brown, to black, to red. They can be solid or have very complex patterns. You should post a more specific question if you're asking about a certain type of snake.
Rat snake or a garter snake...look it up on google images...that what it sounds like yur describing to me
the Australian brown snake even tho it ain't brown prob a relative, also known as easten brown.
Many, many snakes are brown and black, as this coloration is useful for camouflage. The answer to this question also depends on what you would consider a "stripe". The ball python is a fairly common pet snake that has brown and black markings. As do some color strains of corn snakes and garter snakes. The rat snake can be brown with black stripes, but I've never seen one with the reverse. The black-striped snake is so named because, go figure, it is black and striped. Its stripes are brown. Indigo snakes are almost entirely black, but can have brownish markings around their head and chin. The mud snake and crayfish snake are black with a brown belly which can, from the side, look like a single brown stripe stretching the entire length of the snake. The hognose is also black and brown, though again it's more brown with black stripes than black with brown stripes. The night snake can have wither brown stripes or black stripes, but not both. The common kingsnake and the plainbelly water snakes are actually brown with large, black spots, but if you only look quickly they can appear black with many thin, brown stripes. Most other water snakes also have brown and black markings. The whipsnake is a gray with brown stripes. The longnose snake and mountain patchnose snake are black with brown stripes. As is the Western Ribbon snake, though it can also have red stripes in the mix. The copperhead and rattlesnake can also both have black and brown markings, that in some cases will certainly appear mostly black with brown stripes. This is not, by any means, a complete list of snakes that fit the description you gave. If you could post a picture you would, I'm sure, get a more helpful response.
A Grass snake is a browny/green with black dashes. They live in Europe (including western Russia), Northwestern Africa, and Western Asia. They are good swimmers and they eat fish, frogs, and mice. It is one of the most common snakes in Europe.
its rattler..
The King Brown snake also known as a Mulga Snake.
mud snake